Love for 20 x 30 chainrings- Mtbr.com
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  1. #1
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    Love for 20 x 30 chainrings

    I've been playing with gearing set ups on my DW Sultan. I really like two ring set ups, I find I have minimal need for a big ring. My rides consist of everything that Socal has to offer; pavement, fireroads, flowing fast singletrack, technical singletrack, drops, jumps, etc... My bike is set up for abuse, not particularly light.
    After running 22x32, 20x32, 24x36 with an 11-34 cassette, I am really loving my 20x30. I ride this more like a 1x9 dropping down to the 20 on some of the super steep loose climbs I encounter on my rides. On all of the other setups I felt always slightly mis-geared, but the 30 has really hit the mark. I was a bit worried that with the 30-11 I was going to be like a hamster on some of the paved portions and fireroads, but this has really been a non-issue.
    I am actually surprised how much more I love the 30tooth.
    BTW, thanks to Andersen machine for making a great product. I mounted it on my XT crankset with minimal hassle, and the shifting is on par with the XT ring it replaced. And actually the Andersen ring feels stiffer than the XT.

  2. #2
    Recovering Weight Weenie
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    30t is a game changer for me. Makes by rides feel just right.

  3. #3
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    How hard was it to install the ring? I posted a question on their site asking if I could just send them cranks and have it installed by them but didn't get a response. I wanted to go with the 30-22 and 11-34 rather than the 32-22 and 11-36 cassette.
    Annie are you ok? Are you ok, Annie?

  4. #4
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    Quote Originally Posted by morandi
    I've been playing with gearing set ups on my DW Sultan. I really like two ring set ups, I find I have minimal need for a big ring. My rides consist of everything that Socal has to offer; pavement, fireroads, flowing fast singletrack, technical singletrack, drops, jumps, etc... My bike is set up for abuse, not particularly light.
    After running 22x32, 20x32, 24x36 with an 11-34 cassette, I am really loving my 20x30. I ride this more like a 1x9 dropping down to the 20 on some of the super steep loose climbs I encounter on my rides. On all of the other setups I felt always slightly mis-geared, but the 30 has really hit the mark. I was a bit worried that with the 30-11 I was going to be like a hamster on some of the paved portions and fireroads, but this has really been a non-issue.
    I am actually surprised how much more I love the 30tooth.
    BTW, thanks to Andersen machine for making a great product. I mounted it on my XT crankset with minimal hassle, and the shifting is on par with the XT ring it replaced. And actually the Andersen ring feels stiffer than the XT.
    $89 for the 30T ring and it requires crank modifications?

    I like my 30T ring but use a 94/58 spider so it is a standard $30 item.
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  5. #5
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    Dear Shimano, please make an XT lcrankset capable of running off the shelf 20 x 30 rings.

    Thank you,
    The Public

  6. #6
    Nouveau Retrogrouch SuperModerator
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    Quote Originally Posted by ChipV
    Dear Shimano, please make an XT lcrankset capable of running off the shelf 20 x 30 rings.

    Thank you,
    The Public
    They use to (94/58 5bolt) in the early '90s.

    Then they decided 104/64 4bolt was "better." A soution (for a nonexistant problem) that created more issues than it "solved."
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  7. #7
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    I know $89.00 is a bit steep for a chainring. Although after my first few rides on it, the $89.00 was forgotten.
    I wish I would have had a Surly Mr. Whirly 94/58 (I like the external BB cranksets), but alas an XT crankset was bolted on my bike. $89.00 is still a lot cheaper than a new crankset. At least thats how I justify it.
    The chainring was easy to install, and just requires a flat file. Took all of 10min, and is really just a matter of filing a slight bevel on the bolt mounts. The instructions and visuals included with the crankset were excellent.

  8. #8
    ballbuster
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    Dude... tooootally agree with you!

    Quote Originally Posted by morandi
    I've been playing with gearing set ups on my DW Sultan. I really like two ring set ups, I find I have minimal need for a big ring. My rides consist of everything that Socal has to offer; pavement, fireroads, flowing fast singletrack, technical singletrack, drops, jumps, etc... My bike is set up for abuse, not particularly light.
    After running 22x32, 20x32, 24x36 with an 11-34 cassette, I am really loving my 20x30. I ride this more like a 1x9 dropping down to the 20 on some of the super steep loose climbs I encounter on my rides. On all of the other setups I felt always slightly mis-geared, but the 30 has really hit the mark. I was a bit worried that with the 30-11 I was going to be like a hamster on some of the paved portions and fireroads, but this has really been a non-issue.
    I am actually surprised how much more I love the 30tooth.
    BTW, thanks to Andersen machine for making a great product. I mounted it on my XT crankset with minimal hassle, and the shifting is on par with the XT ring it replaced. And actually the Andersen ring feels stiffer than the XT.
    I ran an XT crankset with 22/32/44 for a while with an XT 11-34t cassette. First issue was granny was too tall for my fat arse and the steep grades around here in NorCal. So I found a Action Tec 20t, filed my spider and ran that for a while. THen it was too much gap between the 20t and 32t middle. I found myself dropping to granny all the time just to make it over one little thing. I noticed in my pile of parts I had a 20t 5 arm and a 32t 5 arm, so I found some old Sugino Impels for $12 on craigslist. I fitted those up to be sure they would work well enough while I ordered a 30t vuelta ring form Universalcycles.com. GOt the 30t on there, found a 42t in my parts bin, bolted it up to an LX square taper BB... and I was golden. It was kinda flexy, tho. During heavy out of saddle cranking, the big ring would rub the derailleur a bit, and I could not seem to adjust it out.

    Later, I found a set of Coda cranks, and I already had the XTR Octalink1 BB to go with them.

    So now... 20/30/42t on Codas with XTR BB. Shifts great, perfect ranges for me, works like a charm. 9 speed chains work fine on these 8 speed rings. No issues there at all.

    Man, I only wish Shimano or SRAM would wise up and produce a good external BB 5 arm compact crankset. THe only ones I know of are Surly (nice, but $$$ and heavy) and Middleburn ($$$ and square taper, or ISIS). I loved my XT and LX external BB cranksets. Light, stiff and pretty cheap.

    I now have a spare XTR 5 bolt 94/58mm spider for the M950 series cranks. I'm on the lookout for a set of arms... maybe 180s. I went 180s on my singlespeed and love 'em. It would be better to drop the big ring to a 40t, but I'm not super motivated to spend actual money on it. Maybe I'll find one at a swap meet for cheap.

    Dang, you make a good argument for that $90 30t ring. I really like my XT External bearing cranks, and I already did the same mod for my 20t. I can't see blowing $350 on a different solution. My only issue is blowing $90 on a wear item I tend to get one or two seasons out of at best.

    <a href="https://picasaweb.google.com/lh/photo/gaKvuiDaKLnG5OACvXBekw?feat=embedwebsite"><img src="https://lh5.ggpht.com/_zZ7tZYTZu1o/S_oQKGBmzbI/AAAAAAAAOfA/nvp2IGw1YLU/s800/IMG_2044.JPG" /></a>

    Sugino Impels (polished!!) installed when I first built my Titus RX29er... everything is so clean!!!

    <a href="https://picasaweb.google.com/lh/photo/iRVrxAw5g0RrJKgq41eW_g?feat=embedwebsite"><img src="https://lh3.ggpht.com/_zZ7tZYTZu1o/SnSHachZEUI/AAAAAAAAKi0/MQO8bNiQ9l8/s800/IMG_1641.JPG" /></a>
    Last edited by pimpbot; 07-21-2010 at 01:50 PM.

  9. #9
    Cassoulet forever !
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    if you want something with external bearings, reaaly light, available in several lenghts (180, 185), and compatible with all spiders, then it exist !

    Of course it s expansive. It's the lightning crankset.
    <cite>www.lightningbikes.com</cite>
    Frenchspeaking 29"ers community site http://VingtNeuf.org

  10. #10
    jrm
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    Agreed..

    and id rather use a XT crankset.

  11. #11
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    I picked up a set of these and couldn't be happier! I run it 1x9 so I took the outer ring off and run it 29T up front with a 12-34 XTR cassette. These cranks aren't on the KCNC website, for whatever reason, but Yan has had them for sale for a couple months now on his Ebay site.

    http://cgi.ebay.com/KCNC-K-Type-XC2-...item2c5433f4d0

  12. #12
    ballbuster
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    Nice!

    Quote Originally Posted by DFYFZX
    I picked up a set of these and couldn't be happier! I run it 1x9 so I took the outer ring off and run it 29T up front with a 12-34 XTR cassette. These cranks aren't on the KCNC website, for whatever reason, but Yan has had them for sale for a couple months now on his Ebay site.

    http://cgi.ebay.com/KCNC-K-Type-XC2-...item2c5433f4d0
    Did you say you can get that in a triple? Nice, but $$$$!!

    The scandium BB kinda scares me. I am not a light mammal these days.

    *edit*

    dang... no compact triple. Only a 4 arm triple, compact double. I need my 20t up front.

    Quote Originally Posted by 20.100 FR
    if you want something with external bearings, reaaly light, available in several lenghts (180, 185), and compatible with all spiders, then it exist !

    Of course it s expansive. It's the lightning crankset.
    <cite>www.lightningbikes.com</cite>
    dang... on the website it looks like the same thing here. No compact triple. Fooey!

    Yeah, maybe I won't sell my XTs with the action tec 20t after all.

  13. #13
    Nouveau Retrogrouch SuperModerator
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    Quote Originally Posted by morandi
    I know $89.00 is a bit steep for a chainring. Although after my first few rides on it, the $89.00 was forgotten.
    I wish I would have had a Surly Mr. Whirly 94/58 (I like the external BB cranksets), but alas an XT crankset was bolted on my bike. $89.00 is still a lot cheaper than a new crankset. At least thats how I justify it.
    The chainring was easy to install, and just requires a flat file. Took all of 10min, and is really just a matter of filing a slight bevel on the bolt mounts. The instructions and visuals included with the crankset were excellent.
    I also think about the replacement cost when the ring wears out.
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  14. #14
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    Quote Originally Posted by shiggy
    I also think about the replacement cost when the ring wears out.
    I spend $45-50 bucks on tires that only last me a 3-6 months. Maxxis, geax, specialized are all done after that period of time. Bike stuff is just expensive, no matter how you slice it.

  15. #15
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    there is also the extralite 30t 104 bcd for 58 bucks, whenever it's actually in stock at fairwheel.

  16. #16
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    Been on 20 small ring and 30 middle since I started 29 wheels 4 years ago. Used to have a 40 big ring on my RIP but I break the teeth off after a few rides now just run a bash. I used to be able to buy 5 arm Raceface Turbines on E-Bay cheap...no more hard to find. Not that bad as Middleburn is a good solid crack and I like Phil Wood square taper BB. Actually old Shimano square taper are good and very cheap. As time goes on it seems to be a little harder finding compact replacement chainrings but they are still out there and very reasonably priced.

    Dean

  17. #17
    Always Learning
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    Quote Originally Posted by Dial Tone
    How hard was it to install the ring? I posted a question on their site asking if I could just send them cranks and have it installed by them but didn't get a response. I wanted to go with the 30-22 and 11-34 rather than the 32-22 and 11-36 cassette.
    The mod is very simple with a file. In my opinion, it would be silly to send it to them to do the easy job for you. And the mod does not alter your cranks to the point that you couldn't go back to using the Shimano 32 ring at some point.

    BB

  18. #18
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    Quote Originally Posted by Padre
    30t is a game changer for me. Makes by rides feel just right.
    I was the same way. The 30t just made 29" wheels click for me too. I'm running 30/20.

    After a while with a 30t on Turbine 94mm cranks and troublesome Isis bb's I wanted the stiffness and reliability of the XT external bb crank so I bought one and the Anderson 30T. The ring has been trouble free.

    Next however I didn't like the super wide Q-factor of the XT cranks and wish I hadn't gone through the trouble of making the switch from the Turbines but at least I got away from Isis.

    Some versions of the Race Face Deus XC external bb cranks are lighter than XT's and have a 10mm lower Q factor. I doubt they are as stiff but that's what I'm currently using.
    2 wheels

  19. #19
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    I also run a 30, it's night and day better than the 32.
    I'm on a 1x9 and I can't recall ever wanting to shift past 9th gear even on the road.

  20. #20
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    I been preaching to this for years- the 30/20 combo is abfab- same ratios as a 26 32/22
    I run Middleburns as the have sweet rings and BCD allowing for easy install/replacement.

  21. #21
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    I know one of the ideas behind the 10 speed 11-36 is to cater to 29ers but I don't think adding a cog with a standard 32t will be the same as a 30t. Why is that? I'm convinced that I can feel some difference between different front chainring sizes even if the gear ratio is the same. I'm probably wrong because I don't understand how that could be.
    I am still considering going to a 1x10 with the aforementioned 11-36 and a 33t rotor ring someday.
    2 wheels

  22. #22
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    Quote Originally Posted by pimpbot

    Sugino Impels (polished!!) installed when I first built my Titus RX29er... everything is so clean!!!

    <a href="https://picasaweb.google.com/lh/photo/iRVrxAw5g0RrJKgq41eW_g?feat=embedwebsite"><img src="https://lh3.ggpht.com/_zZ7tZYTZu1o/SnSHachZEUI/AAAAAAAAKi0/MQO8bNiQ9l8/s800/IMG_1641.JPG" /></a>
    How do you like those cranks?

  23. #23
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    20/30 seems very low to me. I'm considering a 26/38 paired with a 11-34 but i fear that I will spin out of gears.

  24. #24
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    38/11 and 29er and run out of gears? this is a mountain bike forum you know. wtf? get off the road or gravel paths

  25. #25
    ballbuster
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    THey work

    Quote Originally Posted by cannotaim
    How do you like those cranks?
    They were a bit flexy around the spider/right BB area. That is, when I would hammer out of the saddle really hard, the big ring/chain would rub the front derailleur slightly. I never could adjust this out at the derailleur. I never really felt flex in the crank arms at my feet, really. I do notice that my old LX or XT outboard bearing cranks felt stiffer at the pedals, but I never really noticed any squirm or flex at the crank arm.

    I ran them with an LX level square taper BB. No noise, no creaking, no other real issues. I liked the narrow Q factor as well. I bolted them up, torqued them down with a bit of loctite in the crank arm bolt, and didn't have to touch them for about 800 miles, until I switched to the Codas.

    Yeah, Sugino Impels are all over the place. They came stock on a lot of bikes in the mid 90s, and can be had at swap meets pretty easily. I got mine at a recycle used parts bike shop (ReCyclery in San Rafael, CA) for $15, the proceeded to blow many hours trying to get a mirror finish out of them.

  26. #26
    ballbuster
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    Hey....

    Quote Originally Posted by gtluke
    38/11 and 29er and run out of gears? this is a mountain bike forum you know. wtf? get off the road or gravel paths
    I hit 43 MPH at Sea Otter on the XC course a couple years ago. It's not that hard to spin out mountain gears, especially if you have a fireroad and real hills in your area.

    If I ran a 32 tooth ring up front and no big ring, I would spin out all the time, even on singletrack.

  27. #27
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    Quote Originally Posted by artnshel
    I know one of the ideas behind the 10 speed 11-36 is to cater to 29ers but I don't think adding a cog with a standard 32t will be the same as a 30t. Why is that? I'm convinced that I can feel some difference between different front chainring sizes even if the gear ratio is the same. I'm probably wrong because I don't understand how that could be.
    I am still considering going to a 1x10 with the aforementioned 11-36 and a 33t rotor ring someday.
    I agree. The 30 just feels right, I don't know why either.
    I would love to see an XTR crankset in a 40-30-20 (you could remove the 40 if not needed)
    Anybody know anything about the new Middleburn crankset with the external BB. Whats the weight on it? Is it available? Chainring options?

  28. #28
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    I have a 29er HT and would love to drop down from 32-22 to 30-20. I am using a 2007 Truvative Stylo crankset.

    Would it be hard to find 30 and 20 ring that would fit on it?

  29. #29
    ballbuster
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    Yeah, do a search.

    Quote Originally Posted by EVERYUSERNAMEISTAKEN
    I have a 29er HT and would love to drop down from 32-22 to 30-20. I am using a 2007 Truvative Stylo crankset.

    Would it be hard to find 30 and 20 ring that would fit on it?
    There are 20 and 30 tooth rings for 4 arm cranks, but they're not cheap, and it takes some modification to get them to work.

    Action Tec makes a 20 tooth. Some guy named Anderson, IIRC, makes a 30 tooth ring that uses special directly threaded chainring bolts.

    In both cases, you have to take a file and bevel your spider a bit to get the chain to drop down and clear, so the chain plates don't ride on the top of the spider and keep the chain rollers from riding on the chianring where they belong.

    30 tooth feels perfect for a middle ring for me (my fat ass), my terrain (hilly, some steep walls, some techy climbing) and my riding style. I find myself in either crawling climbing mode in granny gear, or in more singletrack cruising mode in middle. 30 tooth middle goes low enough I don't have much of a need to drop to granny until I get to an obvious techy part or steep climb. When I ran a 32 tooth middle, I found I had to drop to granny all the time to get over small things, then switch back to middle.
    Last edited by pimpbot; 07-23-2010 at 10:09 AM.

  30. #30
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    Thanks for the info Pimpbot! I beginning to think it would just be easier and cheaper to switch to a 36t cassette in the back.

    Is there any downside to using the 36t cassette?

  31. #31
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    Quote Originally Posted by EVERYUSERNAMEISTAKEN
    Is there any downside to using the 36t cassette?
    It is heavy- all cogs are solid, no machined spider as with higher end cassettes.
    Absolutely no Bling factor.

  32. #32
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    and...

    Quote Originally Posted by D3DO
    It is heavy- all cogs are solid, no machined spider as with higher end cassettes.
    Absolutely no Bling factor.
    ... added torque applies to freehubs was causing come failures, so Shimano made a special 29er hub with beefier pawls. Not sure how that is any different than using a small chianring up front, tho.

    Also, many derailleurs can't reach that far out. I have an older M950 series XTR derailleur, and no matter how I adjust it, the top pulley still rides directly under the 34t cog when in granny up front. I can maybe shorten my chain to pull the derailleur around a bit more, but that would make my 'forbidden gear' so tight it would break the derailleur off or break the chain if I switched into it accidentally (which happens from time to time).

  33. #33
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    Quote Originally Posted by pimpbot
    ... added torque applies to freehubs was causing come failures, so Shimano made a special 29er hub with beefier pawls. Not sure how that is any different than using a small chianring up front, tho.

    Also, many derailleurs can't reach that far out. I have an older M950 series XTR derailleur, and no matter how I adjust it, the top pulley still rides directly under the 34t cog when in granny up front. I can maybe shorten my chain to pull the derailleur around a bit more, but that would make my 'forbidden gear' so tight it would break the derailleur off or break the chain if I switched into it accidentally (which happens from time to time).

    Gotcha. Thanks again for the info. I think the easiest solution is to just get my fat carcass in shape and not worry about it.

  34. #34
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    29t FTMFWy0!
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  35. #35
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    Quote Originally Posted by shiggy
    They use to (94/58 5bolt) in the early '90s.

    Then they decided 104/64 4bolt was "better." A soution (for a nonexistant problem) that created more issues than it "solved."
    AMEN!. Thats why my brand new AIR 9 has a 5 bolt XTR crank (with a rather ugly paint job) on it. I need that 20T ring!

  36. #36
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    Quote Originally Posted by gtluke
    38/11 and 29er and run out of gears? this is a mountain bike forum you know. wtf? get off the road or gravel paths
    Get fitter and better at riding a mtb. Then come back

  37. #37
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    Quote Originally Posted by Drea
    Get fitter and better at riding a mtb. Then come back
    I'd like to see someone big ring trails in NJ

  38. #38
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    I doubt that your trails look like that everywhere.

  39. #39
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    They basically do, some clearer paths but it's basically an entire state of rock gardens.
    Jersey has a huge population density, the only places left with forests are those places that were really really hard to build on. So all our parks are on the side of nasty hills, or in places where rocks prohibit building.

    Here's my last video while we were at Allamuchy with my friend Tim from the south, he has a hard time with the rocks here
    I'm on the Lefty with the loud hub.


  40. #40
    SSolo, on your left!
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    Quote Originally Posted by pimpbot
    There are 20 and 30 tooth rings for 4 arm cranks, but they're not cheap, and it takes some modification to get them to work.

    Action Tec makes a 20 tooth. Some guy named Anderson, IIRC, makes a 30 tooth ring that uses special directly threaded chainring bolts.

    In both cases, you have to take a file and bevel your spider a bit to get the chain to drop down and clear, so the chain plates don't ride on the top of the spider and keep the chain rollers from riding on the chianring where they belong.

    30 tooth feels perfect for a middle ring for me (my fat ass), my terrain (hilly, some steep walls, some techy climbing) and my riding style. I find myself in either crawling climbing mode in granny gear, or in more singletrack cruising mode in middle. 30 tooth middle goes low enough I don't have much of a need to drop to granny until I get to an obvious techy part or steep climb. When I ran a 32 tooth middle, I found I had to drop to granny all the time to get over small things, then switch back to middle.
    Read this thread when it first came up and then bought my Access 9.7 29er (great bike) but after a couple rides, it would really benefit 29ers to have smaller chainrings....20/30/40 or 20/30/38 seem like they would be ideal for 29er mtb imo. I spend most time in middle ring, but often find that one cog is too small but the next up is too big and I'm not hitting a good cadence for me. Thought about my previous 29er HT and same thing, recalling my last 26" HT and it seemed as though all the gears were much better spaced and it all just flowed along as I shifted gears up and down the trails! Soooo....would love to try 20/30/38 or 20/30/40....but the price of just a couple ti chainrings is pretty expensive just to try it out....steel would be nice. My current crankset is TruVativ FireX 3.3 aluminum, 22/32/44T which iirc 104bcd. :/
    Get off the couch and ride! :)

  41. #41
    ballbuster
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    Well, that is probably square taper BB, right?

    Quote Originally Posted by Natedogz
    Read this thread when it first came up and then bought my Access 9.7 29er (great bike) but after a couple rides, it would really benefit 29ers to have smaller chainrings....20/30/40 or 20/30/38 seem like they would be ideal for 29er mtb imo. I spend most time in middle ring, but often find that one cog is too small but the next up is too big and I'm not hitting a good cadence for me. Thought about my previous 29er HT and same thing, recalling my last 26" HT and it seemed as though all the gears were much better spaced and it all just flowed along as I shifted gears up and down the trails! Soooo....would love to try 20/30/38 or 20/30/40....but the price of just a couple ti chainrings is pretty expensive just to try it out....steel would be nice. My current crankset is TruVativ FireX 3.3 aluminum, 22/32/44T which iirc 104bcd. :/
    You can always find some cheap Sugino Impels (or any of the other zillions of 5 arm mountain compact cranks floating around out there) and some chainrings. Easy peasy swap.

    Don't fear the steel granny gear. 20t steel is easy to find used, and probably won't be worn out. Good steel lasts forever.

  42. #42
    SSolo, on your left!
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    Quote Originally Posted by pimpbot
    You can always find some cheap Sugino Impels (or any of the other zillions of 5 arm mountain compact cranks floating around out there) and some chainrings. Easy peasy swap.

    Don't fear the steel granny gear. 20t steel is easy to find used, and probably won't be worn out. Good steel lasts forever.
    Kinda like my current cranksset and would like to just swap chainrings if possible. The middle and big rings are the most important to me since the big ring is almost never needed and I spend most of my time in the middle ring where I ride. Oh yeah good steel rings are fine with me.
    Get off the couch and ride! :)

  43. #43
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    old school bmx rings had the same 110 bolt pattern. i used to run a 40t big ring on my 26r years ago. had to sand it down thinner to work but was strong and lasted for years (bike was 7 speed)

  44. #44
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    Quote Originally Posted by jtibb
    old school bmx rings had the same 110 bolt pattern. i used to run a 40t big ring on my 26r years ago. had to sand it down thinner to work but was strong and lasted for years (bike was 7 speed)
    I need 104 bcd.
    Get off the couch and ride! :)

  45. #45
    jrm
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    Oh my..

    Quote Originally Posted by 20.100 FR
    if you want something with external bearings, reaaly light, available in several lenghts (180, 185), and compatible with all spiders, then it exist !

    Of course it s expansive. It's the lightning crankset.
    <cite>www.lightningbikes.com</cite>
    nice looking

    <img src=https://www.lightningbikes.com/94mm.JPG>

  46. #46
    jrm
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    Thing is..

    Quote Originally Posted by pimpbot
    You can always find some cheap Sugino Impels (or any of the other zillions of 5 arm mountain compact cranks floating around out there) and some chainrings. Easy peasy swap.

    Don't fear the steel granny gear. 20t steel is easy to find used, and probably won't be worn out. Good steel lasts forever.
    for the amount youd spend on the new crankset, rings, Bb and hardware you could buy a cheap suguno 20T and the andersen machine 30T and be done with it.

  47. #47
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    Not the amount I spend ... :)

    Quote Originally Posted by jrm
    for the amount youd spend on the new crankset, rings, Bb and hardware you could buy a cheap suguno 20T and the andersen machine 30T and be done with it.
    IIRC I spent $15 on the cranks (ReCyclery), $15 on the ring set (swap meet), $20 on a new LX bottom bracket (performance Bike price match) ... $50

    Okay, that is not super far off of the $90 Anderson middle ring... so you make a good point.

    Yeah, I'm seriously tempted to get one of those Anderson rings to slap on my XTs with the action tec 20t. Does he make them in silver? Polished?

    Gonna save my dough for now, tho. I might have a new (to me) Singlespeed frame on the way soon, tho. Fingers crossed on that one....

  48. #48
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    I have two sets of Anderson rings I might part with . .

    I'll run the ad on MTBR just to be fair, but I have two sets of 30 and 40 tooth rings that I just installed one of. The mod is not hard on an XT crank but I think I have a problem with my crank itself, so I'm also looking for other solutions and to recoup some $$$

    FWIW my crank has a TON of runout so that the big ring travels from side to side and hits BOTH sides of the FD cage in some gears and I have to trim the front constantly to limit rubbing. This was a problem with my old ring that I thought was a bent ring but the problem continues. The new Anderson ring, of course, is new and the old XT ring lies flat on the table. Bent spider, bent spindle? How would that happen?

    Anyway. . .
    germs, needles, milk, death, snakes, mushrooms, heights, crowds, elevators

  49. #49
    MoJo Moto
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    +1...Anderson Machine...!
    Ride Hard or Ride Home Alone.

  50. #50
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    What about something like these suckers?

    http://www.bikewagon.com/Drivetrain/...-p7919292.html

    Do these accept an Isis bottom bracket or some other proprietary impossible to find now Cannondale bottom bracket?

  51. #51
    ballbuster
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    Octalink1, I think

    Quote Originally Posted by MMcG
    What about something like these suckers?

    http://www.bikewagon.com/Drivetrain/...-p7919292.html

    Do these accept an Isis bottom bracket or some other proprietary impossible to find now Cannondale bottom bracket?
    ... if they are the same as my Codas.

    Yeah, Shimano Octalink v1... basically XTR and roadie BBs, but not XTs or LXs. Those are Octalink v2.

    ... but 170mm?? Really?

  52. #52
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    Quote Originally Posted by pimpbot
    ... if they are the same as my Codas.

    Yeah, Shimano Octalink v1... basically XTR and roadie BBs, but not XTs or LXs. Those are Octalink v2.

    ... but 170mm?? Really?
    I was throwing them out as an option - but 170mm cranks don't bother me at all.

    Probably a PITA to find the Octalink v1 bottom brackets these days though right? Or not? If not, setting that up 1x9 with that 29T chainring might be wicked good for a 29er.

  53. #53
    ballbuster
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    Not that hard

    Quote Originally Posted by MMcG
    I was throwing them out as an option - but 170mm cranks don't bother me at all.

    Probably a PITA to find the Octalink v1 bottom brackets these days though right? Or not? If not, setting that up 1x9 with that 29T chainring might be wicked good for a 29er.
    Fleabay, there are a few new old stock ones. Do a search for XTR M952 bottom bracket.

  54. #54
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    what will work with a slx crankset?

  55. #55
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    SLX is 104 BCD, just like the XT

    So the same rings should work.
    germs, needles, milk, death, snakes, mushrooms, heights, crowds, elevators

  56. #56
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    Middleburns are nice, come in ISIS (Crank Bros. makes a nice durable ISIS BB), come in 180s, and can be set up with a compact 5 arm. Only problem with the Middleburns is the Q factor is about as bad as an XT crank. Otherwise they are really nice, and would otherwise be perfect. Right now I run mine with their Duo set up.

  57. #57
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    Do they?

    Quote Originally Posted by Miker J
    Middleburns are nice, come in ISIS (Crank Bros. makes a nice durable ISIS BB), come in 180s, and can be set up with a compact 5 arm. Only problem with the Middleburns is the Q factor is about as bad as an XT crank. Otherwise they are really nice, and would otherwise be perfect. Right now I run mine with their Duo set up.
    I know a guy who smoked 2 CB ISIS BBs. He only got like 5 or 6 months out of each. He's not a big guy, and never rides in bad weather, and doesn't ride hard or anything... just regular XC trailriding. Granted, CB is good about exchanging them, but who wants to rent BBs six months at a time?

    I gave up on ISIS myself.

  58. #58
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    Quote Originally Posted by Drea
    I doubt that your trails look like that everywhere.
    Oh trust me they do. Our biggest expense per year are tires I average at least 4 sets a year per bike. Very few can survive without slahing the thin sidewall of 29er tires. Not to derail I too run a 30t setup 1x9 and went from a 11-32 to a 11-34 and matches perfect. The wife has been racing 32-22 and finding herself running the granny way more then she would like so may need to drop her gearing too...

  59. #59
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    Quote Originally Posted by BruceBrown View Post
    The mod is very simple with a file. In my opinion, it would be silly to send it to them to do the easy job for you. And the mod does not alter your cranks to the point that you couldn't go back to using the Shimano 32 ring at some point.

    BB
    Could you take a picture of the crank/spider mod so I can understand it. My Anderson 30t is on the way.

  60. #60
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    Quote Originally Posted by ChipV View Post
    Dear Shimano, please make an XT lcrankset capable of running off the shelf 20 x 30 rings.

    Thank you,
    The Public
    +1 !!!

    And don't forget to make 180 's!



    Or beter still.... 21, TWENTYNINE, 38

    jokes aside, A 29er at 21/29/38 would be the closest to a 26" Shimano 24/32/42

    Full suspension builder might have to reconsider their pivot locations though...
    Sent from my HAL 9000

  61. #61
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    added:

    Few people use the currently available 20/30/40 options.

    My guess it's due to the fact that they look old-fashioned with their 5 arm soiders and square tapered spindles


    Even more reasons for the big brands to join in!
    Sent from my HAL 9000

  62. #62
    Always Learning
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    Quote Originally Posted by Bailey44 View Post
    Could you take a picture of the crank/spider mod so I can understand it. My Anderson 30t is on the way.
    That would involve me taking my cranks off the RIP 9, taking off the rings and shooting some pictures for you. Sorry, no can do as that involves a bit more work than even a 6 pack, pizza and an evening of cheap sex would be worth. It's just a small bevel you file near the bolt holes on the crank.

    Russ used to have pictures and instructions of the mod posted some where (here at MTBR.com or on his website). Or maybe an instruction sheet comes with the rings - I can't remember. Contact Russ to find out.

    BB

    Edit: Found the mod pictures that Russ posted. They are in a thread here. See the one with the slight bevel filed onto the crank near the bolt hole? That's the mod.

  63. #63
    MSH
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    Quote Originally Posted by de lars cuevas View Post
    My guess it's due to the fact that they look old-fashioned with their 5 arm soiders and square tapered spindles
    Function>Fashion...at least for me anyway

    I've been running 42/30/20 Middleburn rings (11-32 cassette) on old sq taper Race Face cranks with a Phil Wood Ti BB on my Racer-x 29er since October of last year (thx to jms here on mtbr for the inspiration to bring my old RF's out of retirement and advice on this set-up as he is running the same).
    The whole MB/RF/PhilWood set-up is lighter than a complete XTR M970 BB/crank combo. Here in the Rockies where a lot of the climbing is long and steep it's the perfect set-up for me....especially on those real long days (+5 hrs training rides or races) when you hit a super steep/tech climb and your legs are screaming. I prefer to ride vs walk if I can and that 20T ring certainly helps there.
    I've had the std XTR M970's on my 29er hardtail since I bought it in late 2007 and I definitely prefer the RF/Middleburn set-up.

  64. #64
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    Quote Originally Posted by BruceBrown View Post
    That would involve me taking my cranks off the RIP 9, taking off the rings and shooting some pictures for you. Sorry, no can do as that involves a bit more work than even a 6 pack, pizza and an evening of cheap sex would be worth. It's just a small bevel you file near the bolt holes on the crank.

    Russ used to have pictures and instructions of the mod posted some where (here at MTBR.com or on his website). Or maybe an instruction sheet comes with the rings - I can't remember. Contact Russ to find out.

    BB

    Edit: Found the mod pictures that Russ posted. They are in a thread here. See the one with the slight bevel filed onto the crank near the bolt hole? That's the mod.


    Thank you.

  65. #65
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    I did the Anderson mod and it was easy

    Quote Originally Posted by BruceBrown View Post
    That would involve me taking my cranks off the RIP 9, taking off the rings and shooting some pictures for you. Sorry, no can do as that involves a bit more work than even a 6 pack, pizza and an evening of cheap sex would be worth. It's just a small bevel you file near the bolt holes on the crank.

    Russ used to have pictures and instructions of the mod posted some where (here at MTBR.com or on his website). Or maybe an instruction sheet comes with the rings - I can't remember. Contact Russ to find out.

    BB

    Edit: Found the mod pictures that Russ posted. They are in a thread here. See the one with the slight bevel filed onto the crank near the bolt hole? That's the mod.
    It worked fine for me. I used a Dremel tool.
    germs, needles, milk, death, snakes, mushrooms, heights, crowds, elevators

  66. #66
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    Any comments on what the best derailleur for the 20x30 combination would be? I currently have the 30T (SS version) as a 1x8 but at some point I need to make the bike compatible with trips to Moab.

  67. #67
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    ............

  68. #68
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    Which Dremel Tip?

    Quote Originally Posted by gthcarolina View Post
    It worked fine for me. I used a Dremel tool.
    I don't have much experience with the Dremel even though I have one (maybe two even). I bought a 20T SS granny on Ebay and am considering installing it and the 30T on my LX crankset. Anything that would would make the process quicker would be appreciated.

  69. #69
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    Quote Originally Posted by Cemoto View Post
    I don't have much experience with the Dremel even though I have one (maybe two even). I bought a 20T SS granny on Ebay and am considering installing it and the 30T on my LX crankset. Anything that would would make the process quicker would be appreciated.
    Don't bother with a dremel. Get a flat file link here and it will grind down very quickly, but more importantly it will grind down evenly and you accidently remove too much material. I did it with a file and it took 5 minutes.

  70. #70
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    Quote Originally Posted by BruceBrown View Post
    The mod is very simple with a file. In my opinion, it would be silly to send it to them to do the easy job for you. And the mod does not alter your cranks to the point that you couldn't go back to using the Shimano 32 ring at some point.

    BB
    Mine came in the mail today and I just ordered it 2 days ago.

    Looks like a nice piece and would have went on quickly had the self extracting bolt on my cranks not stripped as they were self extracting.

    Not sure I did the best filing job on the spiders but it seems to work. I will test early in the morning.

    I took one length out of my chain, does that seem about right coming from a 32t to a 30t?


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