Mattoc 27.5+ with a 29" wheel?- Mtbr.com
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  1. #1
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    Mattoc 27.5+ with a 29" wheel?

    Have been looking for a fork than I can use a 29 wheel/tire and a 27.5x3 setup. I was looking @ the Mattoc service manual and is lists the maximum diameter of 742mm & 13mm of arch clearance. My current 29x2.35 measures 743mm. Called Maitou tech and they said "for liability purposes we can not deviate suggestions beyond the printed spec's". Has anyone tried a 29" wheel? Is there a reason the required arch clearance is so much?

    TABLE 1 - TIRE CLEARANCE -
    1)MINIMUM
    ARCH
    CLEARANCE

    2)MAXIMUM
    TIRE WIDTH

    3)MAXIMUM TIRE
    DIAMETER

    FORK MODEL (SEE FIGURE A) (SEE FIGURE B)
    100 MATTOC 26 x 2.4 16mm 63mm 696mm
    100 MATTOC 27.5 x 2.4 6mm 63mm 716mm
    110 MATTOC 27.5 x 2.6 8mm 67mm 725mm
    110 MATTOC 27.5+ x 3.4 13mm 87mm 742mm
    110 MATTOC 29 x 2.35 6mm 65mm 755mm
    110 MATTOC 29+ x 3.4 15mm 87mm 789mm
    110 MATTOC 29+ x 3.0 21mm 87mm 776mm
    100 MARKHOR 29 6mm 69.5mm 754.4mm
    100 MARKHOR 27.5 6mm 71.4mm 730.4mm
    110 MARKHOR 29 6mm 80.4mm 769mm
    110 MARKHOR 27.5 6mm 80.2mm 735.6mm

  2. #2
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    Its not the arch, it's the crown that Manitou is worried about.. Manitou spec requires 6mm clearance at the crown at bottom out to allow for tire deformation and tire manufacturing variations. They will not go away from that.

    You can get do a couple things to get around it.

    1. Check for clearance at full travel and make your own decision on if you feel comfortable with the clearance you find

    2. Put a 3-5mm spacer under the bottom out bumper to give extra clearance at bottom out. You lose a couple mm travel for peace of mind.

    Hope that helps

  3. #3
    RAKC Industries
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    x2^^

    But you have a 1mm difference. Thats going to matter...not one dang bit. If you had 3-4mm more diameter then Id be a little worried.

    Sent from my SM-G950U using Tapatalk
    Life on a bike doesn't begin till the sun goes down.


  4. #4
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    Quote Originally Posted by RAKC Ind View Post
    x2^^

    But you have a 1mm difference. Thats going to matter...not one dang bit. If you had 3-4mm more diameter then Id be a little worried.

    Sent from my SM-G950U using Tapatalk
    That's 1mm on my current tire and i'd like to try a larger tire maybe a 2.6 Recon. X-Fusion lists their 27.5+ Mcqueen fork able to run up to a 29x2.6.

  5. #5
    RAKC Industries
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    Ok so your trying to find a fork you can run 29+ and 27.5+ basically. Your asking to be messing with geo in a pretty extreme fashion.

    Thing to remember though is that many tires are not the size they claim, usually smaller. Especially Maxxis, their great for tires not being claimed width at the tread. And to go with that may not have much difference in Diameter

    That said, you would be better off just getting a 29+ capable fork and being done with it. A fork that can fit 29 x 2.6 and 27.5+ means its basically a widened standard 29er fork. My marvel pro I had on my 29er I could fit a 2.6 wide no problem. Lacking much clearance but no rubbing at all. And that was an XC fork.

    You going to want to keep an eye on AC length too. So much to really screw with your geo and not handle as good as it should.

    Sent from my SM-G950U using Tapatalk
    Life on a bike doesn't begin till the sun goes down.


  6. #6
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    Quote Originally Posted by RAKC Ind View Post
    Ok so your trying to find a fork you can run 29+ and 27.5+ basically. Your asking to be messing with geo in a pretty extreme fashion.

    Thing to remember though is that many tires are not the size they claim, usually smaller. Especially Maxxis, their great for tires not being claimed width at the tread. And to go with that may not have much difference in Diameter

    That said, you would be better off just getting a 29+ capable fork and being done with it. A fork that can fit 29 x 2.6 and 27.5+ means its basically a widened standard 29er fork. My marvel pro I had on my 29er I could fit a 2.6 wide no problem. Lacking much clearance but no rubbing at all. And that was an XC fork.

    You going to want to keep an eye on AC length too. So much to really screw with your geo and not handle as good as it should.

    Sent from my SM-G950U using Tapatalk
    Problem with the 29+ Mattoc is the increased a-c height (551mm). My current ride is a Kona Process 111 running a 120mm fork (530 a-c height).

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