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  1. #1
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    30 tooth 104 bcd

    Who would buy a 30 tooth 104 bcd middle ring, with ramps, if it were available?

  2. #2
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    I probably would, although my brand new (2 rides) EMD seems to do ok with a 20t granny and a 32t/bashguard setup.

    ___________________

    Changed my mind. After more than half a dozen additional rides, including a couple 3+ hour rides in pretty hilly terrain, I think the 32T ring is fine. Knowing what I know now not sure if I would have bothered with the 20T granny, but it gives me confidence just by being there. I'm finding the bigger wheels are so much more efficient that even an old slowpoke like me rides one gear higher almost everywhere.
    Last edited by TFitz; 02-17-2009 at 06:28 PM.

  3. #3
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    I'm running a 20t on my 2008 XTRs. Love it. Love the low gearing. Not sure I'd want the 30t or not. Never had any trouble w/ it so far.
    However-I'd take a 30t w/o ramps just to use on the SS.
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  4. #4
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    Not sure that it's physically possible for that BCD...

  5. #5
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    extralite is already making one.
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  6. #6
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    I've always lost track of various BCDs. I know there are a few tooth options that are possible but look like they won't work (the 20t innner on my XTRs).They do it in a way that the bolts are made clean enough that the chain can pass over them and are spaced so the bolts are in between the teeth ( in the valleys so to speak).

    Extralite does list a 30t 104 on their site. perhaps the threads OP was asking since he/she has the ability to make a few of their own?
    http://www.extralite.com/index_euro.htm

    A second option for oddball chainrings is actiontec but they don't list a 30t 104.
    http://www.actiontec.us/prices.htm

    I'd still take a 30t for the SS. Hate the way the Moots looks w/ a huge rear cog. If I rode in a less hilly place I could step down 2-3 teeth.
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  7. #7
    Always Learning
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    Quote Originally Posted by 20.100 FR
    extralite is already making one.
    Yes, but it is for a 2 x 9 set up only (it's a great looking ring - that's for sure) with no ramps.

    The OP wanted to know who would ride a 30T with ramps for the middle ring on a triple if available. Hey, OP - can it even be done? There isn't room. But, that's why we have 58/94mm BCD sets with the 20/30/40 rings!!!! Kudos to Middleburn for jumping in and taking over to replace the Salsa Pro rings that used to be available in 20/30/40.

    BB

  8. #8
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    I would use one, and I would be willing to grind down my mounting tabs to try so they would clear the chain. And no incorporated chainring bolts. I don't want to snap anything off. Also you could design it around being spaced in a little to avoid the chain contacting the mount tabs. You can get creaking running a spacer between the mount tabs and the ring though. Better yet incorporate the spacer into the ring so that the mounting face of the chainring is a nice flush mount instead of an aluminum spacer. This would give the chain a relief area to clear the mounting tab without being modified.

    The ring would only really be good for SS or 1x or 2x due to the spacer, but I would be fine with that seeing as I want one for a 1x9. On a 2x9 setup you would just have to space the little ring in a mm or two. It would throw off the chainline a bit, but with RF external bb style axle cranks, you could just alter your chainline with those handy little spacers. Or on other brands you could include some nice axle spacers so you could ditch the BB spacers (the ones for adjusting to a 68 or 73mm bb shell) and play with axle spacers to get the required chainline. But then you would have to ditch the internal plastic "seal" that fits between the external bearing cups inside the bb shell.

    I hope that all makes sense. It does in my head. It might be a lot of work for having a 30t chainring. 94bcd cranks are a better setup. They will also ensure equal crank spacing between the chainstays. With the axle spacer idea the cranks wouldn't be centered so crank/chainstay clearance could be a problem. A nice LX, XT quality cassette with a 36t cog is an even better solution. So is getting a left shifter, a little chainring and a front derailleur. But I'm sure you'd sell some if that's your plan. My ideas might sound a little crazy, but I've thought about it more than a couple of times. 94mm BCD cranks are hard to come by. I know EBAY has a fair amount, but they are in "high" demand.

  9. #9
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    I would.

    I think a 30th 104bcd for a std shimano (XT) crank would be a hot setup for me. I can do ok with the current 32th ring but would love to get some gearing back.

    I'd also be pleased with a 31th front ring also. I'm not so sure that a 30th is possible but I know for a fact that a 31th is...Boone use to do it and I know someone with one.

    What you got in mind?
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  10. #10
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    he's got the idea down....

    was at his shop the other night

    been testing a prototype 31 and it's working fabulously
    he knows what he's doing
    there's my official endorsement

    will be testing the 30 soon
    I have no financial ties to him, just a good guy trying to make a unique product

    Charles

  11. #11
    Geritol Power
    Reputation: Duzitall's Avatar
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    Gonna make some more cool bash rings to go with? Choices of CR materials?

  12. #12
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    Quote Originally Posted by BruceBrown
    Yes, but it is for a 2 x 9 set up only (it's a great looking ring - that's for sure) with no ramps.

    Hey, OP - can it even be done? There isn't room. But, that's why we have 58/94mm BCD sets with the 20/30/40 rings!!!! Kudos to Middleburn for jumping in and taking over to replace the Salsa Pro rings that used to be available in 20/30/40.

    BB

    Yes it can and has been done, but not tested yet. I will post the results when it has been thoroughly abused.

    Middleburn makes some really good stuff, almost went with them, But I Choose the Surlys and put my own 74mm spider on so I could run a 20t/28t/bashguard. They also told me that couldn't be done.The 28t is ramped and shifts great. Here is a picture of my 74 mm spider and 20/28/BG.
    Attached Images Attached Images

  13. #13
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    Quote Originally Posted by hammerheadbikes
    he's got the idea down....

    was at his shop the other night

    been testing a prototype 31 and it's working fabulously
    he knows what he's doing
    there's my official endorsement

    will be testing the 30 soon
    I have no financial ties to him, just a good guy trying to make a unique product

    Charles
    The 30t is ready for your abuse.

  14. #14
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    Quote Originally Posted by Duzitall
    Gonna make some more cool bash rings to go with? Choices of CR materials?

    when I can get it, 7050 aluminum if not it will be 7075.

    yep cool bash gaurds will be available.

  15. #15
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    Can I thrash one? I'm running a 1x9. It would get regular daily abusings consisting of snow, sand, salt, and major grime. Hope to see these around soon. I'll take two when they are available.

  16. #16
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    Quote Originally Posted by BRUZED
    The 30t is ready for your abuse.
    sweet!
    I was going to try to get by this evening but got slammed at work
    tomorrow afternoon fo sho

  17. #17
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    UPDATE:
    works perfect
    I am running the 30t on my XT cranks
    too cool!

  18. #18
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    I will take 2 if you are selling them.

    Thanks,

    Brian
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  19. #19
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    Quote Originally Posted by hammerheadbikes
    UPDATE:
    works perfect
    I am running the 30t on my XT cranks
    too cool!
    That great news, I will have two more ready for testing today.

  20. #20
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    I will take two as well when you want to sell them.
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  21. #21
    Te mortuo heres tibi sim?
    Reputation: scrublover's Avatar
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    I'd take a couple as well.
    Florence Nightingale's Stormtrooper

  22. #22
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    Two for the CA sun!
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  23. #23
    HopHeads, Unite!
    Reputation: Lugboot's Avatar
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    I would take 2 as well.... very cool.

    Where do I get 20 tooth little rings for a 4-bolt setup?
    People should not be afraid of their governments. Governments should be afraid of their people.

  24. #24
    Te mortuo heres tibi sim?
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    Quote Originally Posted by Lugboot
    I would take 2 as well.... very cool.

    Where do I get 20 tooth little rings for a 4-bolt setup?
    Same deal as the 30T ring, with the 64mm BCD. Won't work unless somebody does something funky/special. 22T for that is the smallest.

    Someone correct me if I'm wrong, though.

    I just got two 28T 104mm BCD steel Truvativ unramped rings to try out on a 1x9 setup - waiting on a thinner bash ring to mount in the middle ring spot to help with dropping the chain outside. Paired with the JumpStop inside it ought to work fine, but may be a bit lower geared than I really want. Eh, I'm a spinner not a masher anyhow.

    Actually should work decently where and how I ride.
    Florence Nightingale's Stormtrooper

  25. #25
    HopHeads, Unite!
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    I had a feeling that would be the answer. Thanks!
    People should not be afraid of their governments. Governments should be afraid of their people.

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