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Thread: Mach 5.7 27.5

  1. #1
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    Mach 5.7 27.5

    My local Pivot dealer is trying to sell me a Mach 5.7 27.5 which is apparently available and shipping. Does anyone have any info on this?? Nothing at all on Pivot site

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    Ha, not to be rude, but I think your dealer doesn't know what he's talking about Unless they converted one of their stock to 27.5 themselves

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    I was at a demobday for pivot and they mentioned that they are testing kits for putting 27.5 on the mach 5.7, perhaps this is an early release.

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    I asked about this after the last demo at SoMo in Phx, and they Pivot said they have made available the 5.7 Carbon with 27.5 on XT pro build and up. Ships w/ Fox34 140mm fork and travel reduced to 5.2" to prevent tire from hitting seat tube. I'd love to see this at their next demo!

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    I heard something about a kit coming out for the 5.7 as well. Now would this work on the aluminum version?

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    Hey guys I had my 5.7c set up 27.5 this past year and loved it.
    Attached Thumbnails Attached Thumbnails Mach 5.7 27.5-1510410_10202219330701469_896812518_n.jpg  

    I like to ride bikes fast.

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    Quote Originally Posted by HighTitan View Post
    Hey guys I had my 5.7c set up 27.5 this past year and loved it.
    Nice job. I currently have a a 5.7C and am keen to get it to 27.5 to reduce the sizes of wheels in my stables from 26, 27.5 and 29 to just 27.5 and 29. Can you tell me how you managed it?

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    Mach 5.7 27.5

    There is a kit that reduces travel. A friend put a 28,5 wheel with a Nobby Nic in his rear triangle. Not a lot of mud clearance.


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    We are in fact offering the 27.5 kit as an option on 5.7C frames. It uses a shorter stroke shock and the rear triangle will clear a 2.2 HoneyBadger or 2.25 Ardent with no problems. The alloy version has a different rear triangle configuration and the bigger wheels won't fit. We actually have a selection of 27.5 Mach 5.7C demo bikes built up now...
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    Quote Originally Posted by kenbentit View Post
    We are in fact offering the 27.5 kit as an option on 5.7C frames. It uses a shorter stroke shock and the rear triangle will clear a 2.2 HoneyBadger or 2.25 Ardent with no problems. The alloy version has a different rear triangle configuration and the bigger wheels won't fit. We actually have a selection of 27.5 Mach 5.7C demo bikes built up now...
    Is the kit available for current 5.7C owners to purchase

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    Very interesting! How does it ride in comparison to running smaller wheels and how compared to the M6?

    As above, can punters like us order the kit? Is it just a shorter stroke, are you able to reveal the shock stroke? Can this be achieved by offset bushings?

    Looking forward to hearing about this, as I've got a few mates with 650b bikes and it'd be great to try just the stroke/bushing setup with their wheels

  12. #12
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    I meant to get some more info on the kits but got swamped with regular "work" stuff. I'll try to get some more details on Monday, or you can just email info@pivotcycles.com...
    Desert Sunset Calls/Upward, Pain, Perseverance/Welcome Solitude

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    bottom bracket height at the 27.5 set up ?

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    So 130mm travel with the short shock? BB height and head angle with a 140mm 32 fork and a 150mm pike? Clearance for a 2.25 27.5 Hans Dampf? Is the shock a standard length? as frankly the stock CTD is useless compared to a custom tuned CTD with Avy'd internals. Also does the reduced travel negate some of the capability of the bike versus the 26er 5.7c with 34 or Pike? Thanks

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    Sorry for the delay, we've been swamped with stuff and it took me a bit to get some details on the 27.5 setup. 1st off, the kits we have are only available with new complete bikes at this point. We are stocking a smaller number of those parts right now to see how much demand there is and the kits are allocated for complete bikes. As for geometry changes, the only detail that will change is the BB height. It will rise by approx .4". All other angles stay the same due to the shock being the same Eye to Eye length. An offset bushing would lower the BB to a position close to the stock setup but I don't know the exact number for that.
    I did get to take one of the demo bikes out for a weekend and I can honestly say I didn't notice any negative effects from running a shorter stroke shock. The added BB height was nice for some rock clearance but I did notice it feeling a bit tall on one particular section that's a steep rocky chute with high speed drops into tight turns. It's kinda like a bobsled course made of rock but much steeper. Everywhere else was fine and the larger wheel size more than made up for the reduced travel.
    Desert Sunset Calls/Upward, Pain, Perseverance/Welcome Solitude

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    Quote Originally Posted by kenbentit View Post
    Sorry for the delay, we've been swamped with stuff and it took me a bit to get some details on the 27.5 setup. 1st off, the kits we have are only available with new complete bikes at this point. We are stocking a smaller number of those parts right now to see how much demand there is and the kits are allocated for complete bikes. As for geometry changes, the only detail that will change is the BB height. It will rise by approx .4". All other angles stay the same due to the shock being the same Eye to Eye length. An offset bushing would lower the BB to a position close to the stock setup but I don't know the exact number for that.
    I did get to take one of the demo bikes out for a weekend and I can honestly say I didn't notice any negative effects from running a shorter stroke shock. The added BB height was nice for some rock clearance but I did notice it feeling a bit tall on one particular section that's a steep rocky chute with high speed drops into tight turns. It's kinda like a bobsled course made of rock but much steeper. Everywhere else was fine and the larger wheel size more than made up for the reduced travel.
    Thanks for the info, Ken.

    Glad you have clarified there is minimal change in geometry with the larger hoops with only a slight increase in BB height.

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    Hey Ken- Any update on these kits? Scott at my LBS said you're bringing some 27.5 demos to Endless on Saturday - but only down to a small. I have an XS 5.7c - would the kit work with an XS? What's included in it and what would it cost?

    (I will be demo-ing an XS Les 27.5.) :-)

    thanks.

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    The 27.5 kit works on all sizes since they all share the same rear triangle. I don't know of any availability issues but I believe they're still just going to be part of complete bike sales, not ala carte...
    Desert Sunset Calls/Upward, Pain, Perseverance/Welcome Solitude

  19. #19
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    Quote Originally Posted by kenbentit View Post
    The 27.5 kit works on all sizes since they all share the same rear triangle. I don't know of any availability issues but I believe they're still just going to be part of complete bike sales, not ala carte...
    Thanks for your reply. Def let folks know if Pivot decides to sell the kit on its own!

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    Cheers for the update Ken!

    Any chance you can let us know what the stroke of the shock you're using in the kit is? I'm keen to potentially experiment with this! Looking at the option of shortening the stroke during an upcoming service, or with the spacer method I saw a while ago

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    Mach 5.7 27.5

    Yeah, that would be great. Can you share the components/ parts you're using for the conversion? Thanks!

  22. #22
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    The shock is the same eye-to-eye with a 2" stroke. Other than that, it's a 27.5 specific fork and wheelset.
    Desert Sunset Calls/Upward, Pain, Perseverance/Welcome Solitude

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    Thanks for that Ken! Looks like some testing may be in order down under

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    Oh my. I'm sure you'll have tons more interest in this, me included. A 650b 5inch+ travel rig at 5lbs?! Perfecto.

    I'm assuming all we'd need to do is add some nylon spacers onto the shock's inner shaft. It looks like HighTitan did something to make it work. Inquiring minds want to know.
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    In addition to the 650b wheels/fork. Has anyone considered slackening the head angle? I'm curious to know how this change will affect the ride and other geom of the bike?

    AngleSet

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    Okay, so Pivot says they use a 140mm fork on the 650b conversion to keep the HA the same. So, if I one uses a 150mm fork, it will slacken it? How does this affect the ride? Sorry I'm new to this.

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    I know this link is for a Yeti but the point is the guys from Bike mag make an interesting point which is Yeti has an awesome long travel 26" bike and a kick ass 29r but the 27.5 version is not better than either one of them. Then they basically say the tweeter ain't all that.

    Considering Pivot makes the best long travel 26" bikes in the 5.7 and Firebird, granted Chris C says the 27.5 version is pretty darn good. I would leave it up to him to figure out figure out if they can make a better bike because we know they can. It be good to know if Chris thinks the 5.7 with 650s is better or just a way to meet customer demand.

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  28. #28
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    Quote Originally Posted by Isildur View Post
    Ha, not to be rude, but I think your dealer doesn't know what he's talking about Unless they converted one of their stock to 27.5 themselves
    You can convert your Mach 5.7 Carbon to fit 27.5 wheels, by reducing the stroke of travel on the shock. It's easier to just buy a new shock, 7.875x2.0 vs. the 2.25 the 26" version uses.
    This basically changes the bike to a 5.2, as we need to limit the rear wheel from contacting the seat stay.

    The only compromise here, is the tire clearance is limited to 27.5x2.25 and 2.3 tires. It will clear a 2.25 Hans Dampf. We recommend running a 27.5 140mm fork.

    We have been shipping these for nearly 6 months now. We will have an official announcement on this later in the month, once we receive more stock on the rear shocks.

    We had some sponsored riders racing this set up last year. Their only comment was they wished it could fit a 2.4 tire. Otherwise they loved it.
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    Quote Originally Posted by katen21 View Post
    Okay, so Pivot says they use a 140mm fork on the 650b conversion to keep the HA the same. So, if I one uses a 150mm fork, it will slacken it? How does this affect the ride? Sorry I'm new to this.
    It will slacken it a little less than a degree, but it will also raise the BB more than a half inch. If you are looking to slacken it, you would better off getting a angle set headset to adjust the head angle.
    "The face of a child can say it all, especially the mouth part of the face".
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    Cheers for the updates Dan, very informative! I'll check out some shocks, but may end up just spacing the stroke to play, as it's easy enough to fit the spacers I've got a few mates with 650b bikes, so I reckon I'll be able to borrow their fork and wheels easy enough!

  31. #31
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    The kit comes with a shorter stroke 2" shock vs. the stock 2.25" stroke (I think it was 2.25"). Anyhow, you could do the same by putting in spacers though it may change the shock's performance. But I modded the shock on my old TRc and didn't notice a performance difference.

    If I did this I'd also like to add an Angleset for 0.5-1 degree more slack. This would be better vs. using a 150mm travel fork as I like a low BB height for snappier handling.

    What I'm curious about is the tire clearance. When I called Pivot they said a 2.25 HD had clearance but not sure how much. It's not fun when muds and rocks pack up and saw-tooth the carbon.

    Anyone with more experience on this mod care to chime in?
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    I just converted my 5.7 to 27.5. I thought about adding spacers to shorten the stack, but eventually decided to buy a new rear shock w/ 2" stack. Also running a 140mm fork.

    Impressions:
    Very capable trail bike. Ascends incredibly efficiently (much more than Mach 6, which I rode for a week in Moab earlier this year). I was worried about increasing BB height, but I really don't think I notice it much, but tough to know. Don't notice the reduced travel at all, but I can tell roll-over and momentum is improved with larger wheels. I'm using Maxis 2.25 in rear with no tire clearance issues, even in mud. Overall, love the change. I really think the geo is great, but in the back of my mind, I wonder if a lower BB would be even better????

    Any thoughts on BB height for those who have converted their 5.7 to 27.5?

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    I reckon looking at the BB height of the 27.5 version of the 5.7 that a 2016 Mach 5 27.5 is inevitable. The ultimate all day epic trail bike. Perfect blasting local trails, but also for the occasional road trip to bigger mountains.

    135mm rear travel, 140mm fork (67.2 HA) with 150mm (66.7 HA) as an option (and make sure the seat angle still makes sense with the 150mm fork). Lower BB and a bit more reach compared to the Mach 6. Combined with the short chainstay's this makes it a super manoeuvrable precision tool in technical terrain. That's all, perfect bike for a lot of people.
    Last edited by CS645; 09-19-2014 at 11:13 AM.

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    Quote Originally Posted by CS645 View Post
    I reckon looking at the BB height of the 27.5 version of the 5.7 that a 2016 Mach 5 27.5 is inevitable. The ultimately all day epic trail bike. Perfect blasting local trails, but also for the occasional road trip to bigger mountains.

    135mm rear travel, 140mm fork (67.2 HA) with 150mm (66.7 HA) as an option (and make sure the seat angle still makes sense with the 150mm fork). Lower BB and a bit more reach compared to the Mach 6. Combined with the short chainstay's this makes it a super manoeuvrable precision tool in technical terrain. That's all, perfect bike for a lot of people.
    +1 It would surprise me if Pivot isn't already working on this. Can't imagine CC would be satisfied with a makeshift conversion for the 5.7 to fill that sweet spot in the 27.5 line up. I think you've got the numbers just right... BB around 13.2". This should be good.
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    Quote Originally Posted by KRob View Post
    I think you've got the numbers just right... BB around 13.2". This should be good.
    Why not make it 12.5", yer gonna hit sh~t anyway.
    Nice KOM, sorry about your penis.

  36. #36
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    I had the rear shock serviced on my Mach 5.7 and they accident rebuilt it with a 2 inch stroke. I rode it this way without knowing or noticing any difference for a few rides. It wasn't until I realised I was not getting full travel that I realised what they had done. Anyway when I had it set back to 2.25inches it just felt so much plusher and bottomless on drops and rough terrain.
    I think I'll wait for a purpose built 650b Pivot bike, hopefully with 140mm of travel.

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    I'm looking at the Mach 5.7 27.5 for my next bike. I coming off a 10 year old gary fisher. If you all were in the same boat would you pull the trigger this year or wait for the possible release of a purpose built 27.5?

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    Integra, I just sent a PM...

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    Personally if I was gong to get a new bike and you're set on the 5.7, I'd wait for the purpose built model.

    I've got a 5.7C at the moment and am very happy with the 26" build. I won't be going with the conversion setup, but if they come out with a new 5.7C it may tickle my fancy...

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    Would you look at the mach 6 or would that bike be another animal all together......rode one around a parking lot and it seemed like a lot of bike( it was a medium and I would ride a small so that may have been part of it).

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    For me, the trails I ride and the style that I like to ride in, I think the Mach 6 is too long, slack and burly Killer bike, a mate of mine has one and I've had a quick punt around on it, but I must have lucked out as the 5.7C is my perfect bike.

    The combination of a slack-but-not-too-slack 67 deg HA, the short cockpit and the lightness (mine sits between 11kg and 12kg or so, depending on the wheelset of the day and the amount of dirt still there) make it my fav bike I've ever owned.

    Haha, and just because I couldn't resist, here's my build thread Been a few changes since the last update, but still light, fast and nimble My Mach 5.7 of Carbonium Goodness

  42. #42
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    Quote Originally Posted by Integra204 View Post
    I'm looking at the Mach 5.7 27.5 for my next bike. I coming off a 10 year old gary fisher. If you all were in the same boat would you pull the trigger this year or wait for the possible release of a purpose built 27.5?
    Depending on the trails where you ride, I wouldn't rule out the Mach 4 Carbon. It's maybe not the best suited for chunky rocks. Otherwise, I'd wait for the next version of the longer travel trail bike.

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    I am going with the pivot because I am getting 25% off at my LBS so it's a hard deal to pass up. I really didn't want to wait another year lol. I rode the mach 4 carbon and I really would like a bit more travel southern AZ is really rocky

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    Sub'd for posterity, info, hopeful positive input & stories,
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    Is it tire height or width that limits the 27.5 conversion to a 2.3 tire? I'm actually looking to do a 26+ conversion. I've got a dirt wizard 2.75 that surprisingly fits in the back on my Trance x0, not much mud clearance but it fits. And that triangle has a vertical bar right in front of the tire.

    Also wondering about sizing the frame. I'm 5'6" and would get a M in either a Bronson or a 5010 based on demo rides I've had.

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    Both height and width of the tire can be an issue. Mine came with a Honey Badger 2.2 (tubed) on the rear with a few mm of clearance.

    I swapped out with a NevegalProX (2.35) tubeless and a slightly less amount of height clearance but saw some scratches on the center and right inner side of the triangle. I then went to WTB Trail Boss (2.2) and had rubbing in the center due to height. (tough version which has long and firm sidewalls, although I think the light will also be too tall)

    Going to look to go back to the honey badger (SCT) version..hopefully it will clear well. (the sidewalls on the Honey Badger are quite a bit shorter than the Trail Boss and Nevegals).

    Regarding frame size, I'm 5'11 and chose the M as I was riding a large 29" (Stumpjumper) before and wanted a bike that I control better. I rode a large Mach 5.7 around the LBS as well, but felt better on the M.

    Love the bike...just want to get the "right" rear tire for the various trails I ride here in So Cal that won't rub and isn't a rock grinder.

  47. #47
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    Completely considering this. New fork, New shock, and send my I9s back to I9 and have them rebuild the wheels with new 650b rims and spokes...

    Which tires clearance is more of an issue? Width or height? Going with wider rims may be a mixed bag of results.

  48. #48
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    db,
    My 5.7 came with a Honey Badger as well but it wore horribly and needed to be replaced 2 months after buying it. I ended up going with the Maxxis Ardent 2.25. Works great here in the Northeast. Clearance is tight, only 3 or 4 MM, but adequate for the tire size I like. I also noticed some scratches in front of the tire near the front of the rear triangle. My LBS suggested putting some scuff patches on the frame to keep it from wearing any more.

  49. #49
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    My LBS is converting my bike right now. Just waiting on the rear shock, which they sent back to Fox to get it rebuilt to a 5.2. I had I9 wheels and debated trying to get them rebuilt, but it seemed easier just to get 28H King hubs with Stan's rims and build them up. The proprietary-ness of the I9 spoke system is a bit crazy - $7 per spoke? I'll sell the I9's to make up for at least half of the cost of the new wheels. Going with the Maxxis Ardent 2.25 tires as well. I'm not super worried about clearance because I'm not very big - 5'1" (riding an XS frame). Guess I'll see next weekend.

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    Test fit my son's 650b wheel/tire off his Enduro and the sides fit, but the slaughter rubs on the chain stay bridge. Did they change the frame clearance at the chain stay bridge? My frame is a 2012-2013.

    Mach 5.7 27.5-image.jpg

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    JeepNut - I don't think they changed the clearance but only a few tires will work without rubbing. I have a Kenda Nevegal XPro on the rear now and it doesn't rub...but don't really like the tire so going to try the Ardent that other folks are using. I had a WTB TrailBoss (2.25) on that I liked, but like the picture you show, it rubbed on the bridge and started to put a groove in it (after only 12 miles), so had to swap it out.

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    Db-mtb, I am going to try a Specialized Ground Control 2.1. Plan to test fit it this Sunday to see if it fits. Looks like a decent tire. Also tried an Ardent 2.25 and it rubbed as much as the Slaughter...

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    Mach 5.7c converted - 2015 Nobby Nic 2.25 Pacestar snakeskin (only way to go) in the rear - great grip on the Socal Hardpack - better than the Racing Ralphs and Ardent Race.
    It clears the frame with a few mm of space
    S.C. TB2
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    Supersix Evo 1 Hi Mod D/A

  54. #54
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    Quote Originally Posted by StumpyElite2010 View Post
    Mach 5.7c converted - 2015 Nobby Nic 2.25 Pacestar snakeskin (only way to go) in the rear - great grip on the Socal Hardpack - better than the Racing Ralphs and Ardent Race.
    It clears the frame with a few mm of space
    What rim do you have it mounted on? Riding conditions where you ride?

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    Quote Originally Posted by Jeepnut22 View Post
    What rim do you have it mounted on? Riding conditions where you ride?
    Wheelset: Sram ROAM 50
    Riding Conditions: Southern California Hard-pack and Loose over Hard-pack mostly.
    Riding mostly in the Santa Monica mountains and vicinity
    S.C. TB2
    Flash29C2
    Niner One9 SingleSpeed RDO fork
    Supersix Evo 1 Hi Mod D/A

  56. #56
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    Thanks SE2!

    I will either be running Derby rims, or the stock aluminum I9 rims. Any thoughts to the rim width changing clearance?

  57. #57
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    Quote Originally Posted by Jeepnut22 View Post
    Thanks SE2!

    I will either be running Derby rims, or the stock aluminum I9 rims. Any thoughts to the rim width changing clearance?
    Sorry, I am not familiar with the above rims.
    As I mentioned earlier in this thread, the clearance is tight and may not work great when riding in muddy conditions.
    Not an issue in Southern California...
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  58. #58
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    Just checked my frame after 4 rides on my converted XS 5.7c and I'm seeing some rub on the back rear triangle. I'm running a Maxxis Ardent 2.25 in the front and rear on Stans Crest rims (I ride more trail than xc, but am light so went with the Crest rim).

    I need to swap out the rear tire, so I don't get more rub (I put a sticker there in the meantime).

    Any suggestions?

    I'm riding Northern California hardpack, roots, rocks, dust (we have a drought).

    Thanks in advance,
    Laine

  59. #59
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    I am pretty sure all converted 5.7C has Rub marks there... I have a Large Frame with Rub marks.
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  60. #60
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    Quote Originally Posted by StumpyElite2010 View Post
    I am pretty sure all converted 5.7C has Rub marks there... I have a Large Frame with Rub marks.
    I thought that there were some tires that recommended that have clearance. (I thought the Ardent was one - but guess I was wrong about that.)

    Anyone else have any reccos?

    Thanks!

    Mach 5.7 27.5-2015-06-28-18.53.25_sm.jpg
    Last edited by laine; 06-28-2015 at 09:57 PM. Reason: added photo

  61. #61
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    Just put on a Bontrager XR3 Expert 2.20 in the rear, and I can see a quarter inch of clearance. The tread is also a bit smaller than the Ardent. Going to test it tomorrow - hoping I like the tire. If I don't like it, I'll probably try the Maxxis Ikon 2.2 or Continental X-King 2.2.

    Anyone try these yet?

  62. #62
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    I just installed Conti Mtn King II 2.4 front, 2.2 rear. The rear has more clearance than with the Maxxis Ardent 2.2 the bike came with and hopefully more traction especially braking.

    jummo

  63. #63
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    Jummo- Let me know what you think of the Conti Mtn King II 2.2 in the rear.

    Thx.

  64. #64
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    Quote Originally Posted by laine View Post
    Jummo- Let me know what you think of the Conti Mtn King II 2.2 in the rear.

    Thx.
    I was able to ride today. The new tires are very good, much better grip if a little more rolling resistance. I knew rear tire clearance was an issue with this bike, but I don't need a lot of choices, just one that works well is enough.


    jummo

  65. #65
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    3M tape, will it help protect the frame for a reasonable time if placed in the chain stay bridge?

    The 2.3 Slaughter I tried BARELY rubbed, and maybe the tape would mitigate.

  66. #66
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    How are people finding the high BB height after the 27.5 conversion? It does seem to make it well higher than most other similar travel/style bikes..

  67. #67
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    I just have a couple of rides on my 27.5 Mach 5.7, but I didn't really notice any big difference on the BB height. If anything, I noticed no pedal strikes. Bike handles really well, which makes me think it is amazing with 26" wheels, but you sacrifice in other areas then.

  68. #68
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    Just converted my 5.7c to 27.5. Running a Ardent Race 2.2 on Reynolds Black Label AM rims on rear with about 1/4" clearance. Mach 5.7 27.5-img_4374.jpg
    Kokopelli Racing

    "Curb drops to flat, or curb drops to transition? There's a BIG difference there." Qfactor03

  69. #69
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    I put a 27.5 on the front wheel of my 5.7c, with a 27.5 fox 34 150mm. and left the 26 on the rear. It only effected the bottom bracket height minimally. Slackened the head angle a little. I also have a mach 6c. Lately, I ride the 5.7c more than the Mach 6c. Both are great bikes. But the 5.7c with a 27.5 in the front is no less a bike than the mach 6. just different feel.

  70. #70
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    Mach 7.5 Converted to 27.5 (F/R)- no pedal strikes
    Mach 429 Trail - Lots of them...

    Never rode the 5.7 as a 26er, but as a 27.5er it is definitely fun and nimble.
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  71. #71
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    Looking for some advice/feedback here:

    Been riding with the Bontrager XR3 Expert 2.20 in the rear and not loving it on the Norcal trails. It just doesn't have the grip I want - I find myself skidding where I used to be in more control. The drought out here means we have a lot of loose terrain.

    Currently tubeless on 2015 i9 Torch Trail rims.

    I'm currently considering:

    Continental Mountain King II 27.5 Tire 2.2
    Continental Mountain King II 27.5 Tire > Components > Tires > Dirt Tires | Jenson USA

    Nobby Nic 2.25 Pacestar snakeskin
    Schwalbe Nobby Nic 27.5" Tire > Components > Tires > Dirt Tires | Jenson USA

    Hans Dampf 2.25 Trailstar
    Schwalbe Hans Dampf 27.5" Trailstar Tire > Components > Tires > Dirt Tires | Jenson USA

    (links so you can see the tire tread)

    Also a little unclear on the difference between Pacestar and Trailstar - it looks like Pacestar tread might have more clearance, but trailstar is grippier?
    SCHWALBE Triple Star Compound | Schwalbe North America
    The Hans Dampf 2.25 only comes in Trailstar. The Pacestar is in the 2.35 size, but I think that might be too big for the clearance.

    Anyone using any of these and have any feedback?

    Thanks.

  72. #72
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    I've tried the Mountain King in 26" and it's a decent tyre. The challenge is that my riding conditions in Australia are not the same as yours in SoCal.

    Interestingly, I've converted mine to 27.5 and had the choice of Ardent 2.20 and Crossmark 2.1 and chose the latter. In truth, I've got so much room at the rear I could have run with the Ardent.
    Had a DHRII on there and it rubbed on the top of the tread, which is a shame.

    Looking forward to riding it to see how different it feels. Conversion was so easy and reducing the shock travel was WAY easier than I thought it would be.

    If it works it might stave off new bike syndrome for a while, if not, I'll sell the wheels and keep as 26"

  73. #73
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    After much experimentation and research, I've decided to just run mine 27.5 f/ 26 r. Tire choices were just too limited in 27.5. Also found a lot of good reviews on the Liteville 601 and Foes Mixer where they are successfully running a smaller rear wheel and the science behind it. No noticeable change in geometry really and it rails like ever. I'd dare say the 27.5 in the back feels faster on the flats, but I just hated the thought of messing up a frame that I really like.

  74. #74
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    Quote Originally Posted by JonJones View Post
    I've tried the Mountain King in 26" and it's a decent tyre. The challenge is that my riding conditions in Australia are not the same as yours in SoCal.

    Interestingly, I've converted mine to 27.5 and had the choice of Ardent 2.20 and Crossmark 2.1 and chose the latter. In truth, I've got so much room at the rear I could have run with the Ardent.
    Had a DHRII on there and it rubbed on the top of the tread, which is a shame.

    Looking forward to riding it to see how different it feels. Conversion was so easy and reducing the shock travel was WAY easier than I thought it would be.

    If it works it might stave off new bike syndrome for a while, if not, I'll sell the wheels and keep as 26"
    JonJones- I'm in Northern California. What type of riding conditions do you have in Australia?

  75. #75
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    Sorry Laine, I should not have been so presumptuous in my response.
    The trails in Melbourne that I ride on most are loose over hard. It's generally very dusty and when it rains the drainage is wonderful so it (mostly) stays compact and provides the hero dirt we lust after.

    Prolonged dry spells mean lots of dusty powdery trails with precious little grip.

    In these conditions the MK works pretty well on the rear I've found. Sometimes on the front it can wash out where a Trail King seems to hold on. This is in my experience.

  76. #76
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    Hi all,
    So a brief update. I tried running mine with the 650b conversion and I have to say that I'm not sold on it one bit.

    The 26" handling and capability is simply outstanding and all I felt was that the;
    rollover was only marginally better, and the raised BB height made pedalling over things really easy BUT made the bike feel unbalanced. I was running a 150mm fork granted.

    I don't often get pedal strikes so this is a win I didn't need for losses I really would prefer not to take.
    That beautiful planted and nimble / balanced feel was gone and it just ruined the ride in my view.

    BTW - I have two other bikes I ride in rotation so adapting to a bike is not huge challenge for me. (not boasting, just stating).

    Personally, for me I'm leaving it as the good folks at Pivot intended. It's a winning 26" trail bike so there's precious little benefit for me to convert it.

    I'm not a hater by any means btw. I've tried all sorts of bikes and the wheelsize is not the primary factor. YMMV.

  77. #77
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    Jon Jones - I run 650b on the front of my Mach 5.7 and 26 in the rear and really like the way the bike handles. I also have slackened the head angle with an angle set. I was told the angle set could be problematic. But mine is working fine. no creaking. Also wide bars and a short stem. I like the set up.

  78. #78
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    I also left mine with a 140mm fork with the 27.5 front. Really liking it as well and I'm guessing the geometry isn't that far off from 26/26 with the reduced travel up front. Now I just have to decide if I want to convert the shock back to 5.7 from 5.2.

  79. #79
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    FYI, I ended up putting a Maxxis DHRII 2.3 in the front and a Nobby Nic 2.25 in the rear. Really happy with the grip I'm getting, and I have a few mm of clearance.

  80. #80
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    Quote Originally Posted by endo_alley View Post
    Jon Jones - I run 650b on the front of my Mach 5.7 and 26 in the rear and really like the way the bike handles. I also have slackened the head angle with an angle set. I was told the angle set could be problematic. But mine is working fine. no creaking. Also wide bars and a short stem. I like the set up.
    Thanks Endo_alley. Great to hear you're loving yours. It seemed to me to be too much of a compromise and lots of fiddling about for not much more benefit. Perhaps with a 140mm fork it might feel better but I'm not sold on playing with it further. I'll ride it or sell it. :^)

  81. #81
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    Quote Originally Posted by LoneStar View Post
    I also left mine with a 140mm fork with the 27.5 front. Really liking it as well and I'm guessing the geometry isn't that far off from 26/26 with the reduced travel up front. Now I just have to decide if I want to convert the shock back to 5.7 from 5.2.
    Seems like that's the ticket to success with this. I'm running a Pike @ 150mm and so I'm leaving it as is. On 26" it's more than capable. Well done on getting it to work for you!

  82. #82
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    Quote Originally Posted by laine View Post
    FYI, I ended up putting a Maxxis DHRII 2.3 in the front and a Nobby Nic 2.25 in the rear. Really happy with the grip I'm getting, and I have a few mm of clearance.
    Good work! Nice tyre choices on both ends.

  83. #83
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    Quote Originally Posted by JonJones View Post
    Thanks Endo_alley. Great to hear you're loving yours. It seemed to me to be too much of a compromise and lots of fiddling about for not much more benefit. Perhaps with a 140mm fork it might feel better but I'm not sold on playing with it further. I'll ride it or sell it. :^)
    Yeah, if I had to do it all over again...and I had a 26" fork that would have worked laying around...I'd probably have just ran it at 26" f/r with big tires and called it a day.

  84. #84
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    That's exactly what I'm going to do. 2.4" tyres here we come! :^)

  85. #85
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    Quote Originally Posted by JonJones View Post
    Thanks Endo_alley. Great to hear you're loving yours. It seemed to me to be too much of a compromise and lots of fiddling about for not much more benefit. Perhaps with a 140mm fork it might feel better but I'm not sold on playing with it further. I'll ride it or sell it. :^)

    No compromise at all. Great setup. I have a Mach 6. And this bike works about as well.

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