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  1. #1
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    Stans Crest Flex causing brake rub?

    When making left hand turns, both front and rear brakes start to rub. Only left hand turns, not right. My TRc didn't do this when I had 26" Crest on. Now with the Crest 650b it does.

    Could the extra size of rim be causing flex of the fork, frame, or what?
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  2. #2
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    Yeah, I would say so. Were the wheels built the same way?

  3. #3
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    Quote Originally Posted by myitch View Post
    Could the extra size of rim be causing flex of the fork, frame, or what?
    Glad to see that you're thinking logically about this compared to folks who blame the rims themselves for brake rub on a hub mounted brake.

    The larger wheels will create a greater torque on axles - very much a driving force behind front and rear thru axles on larger wheel platforms.

  4. #4
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    But I've got 15mm on the front. Do the 29ers have this problem too?
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  5. #5
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    Quote Originally Posted by myitch View Post
    But I've got 15mm on the front. Do the 29ers have this problem too?
    Same hubs? Same caliper position?

    15mm TA is supposed to be as stiff as 20mm TA according to the manufacturers but I'm not sure how that plays out in the real world.

  6. #6
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    Quote Originally Posted by GTscoob View Post
    Same hubs? Same caliper position?

    15mm TA is supposed to be as stiff as 20mm TA according to the manufacturers but I'm not sure how that plays out in the real world.
    26" wheelset has Hopes built by them. 650b built by Stan's with their hub everything else is same, XT brakes.

    I'm sure 20mm is stiffer but enough to prevent rub? Good question
    We Ride In God's Country!

  7. #7
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    Were the wheels laced the same way? 2x, 3x? it makes a difference.

  8. #8
    Wrench
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    Same rotor?

  9. #9
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    Prabably the left hand brake pad is closer to the rotor than the right pad...

  10. #10
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    Bleed a little fluid out of the brake system, gaining clearance between the pad & rigor. Then adjust the lever to preference.

  11. #11
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    Quote Originally Posted by myitch View Post
    But I've got 15mm on the front. Do the 29ers have this problem too?
    Nope. I've been using mine for about a year now. These wheels never leave my bike and I ride almost everyday, as well as race with them, and I have yet to true them or have any problems with them.
    Yeti SB-66 Carbon

  12. #12
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    Everything is same except the wheels. Alignment isn't the issue as it only rubs on left hand turns. Straight riding and right hand turns, no problems. Same 3x cross lacing both wheels.
    We Ride In God's Country!

  13. #13
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    Your hubs are fixed to the axle. How would the size of rim matter? This is just flex in the frame or fork.

  14. #14
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    I am naturally more at ease doing left turn so I go harder at it. Maybe that's your case also.

    I had brake rub once when I ran an XT hub that needed bearings adjustment.

    The TRCs that ride up here run in DT 350 hub/dt supercomp spokes+ WTB I19rim. The rear hubs have a 10mm thru bolt which is stiffer than regular qr.

    In that order of cost/effectiveness I would do:
    1- get the10mm thru bolt . This one I am sure.

    The next 2 are a guess as they don't increase frame/hub interface and stiffness.
    2- re-lace with stronger round spokes. You still get the lighter rotational weight of the rims.
    3- replace rims with Arch EX 650b.

  15. #15
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    I have a TRC with 650b Crests and have never had this issue. With all my gear on I am probably around 200 lbs. I have a front 15mm and rear 10mm though bolt. What fork are you running?
    2012 On One Whippet 650b
    2012 Santa Cruz TRc 650b
    2014 On One Dirty Disco
    2010 Soma Groove
    1987 Haro RS1

  16. #16
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    Old thread but thought I'd chime in. My personal experience as follows:

    - 26 inch arch ex on my hardtail with XT brakes... zero rub/noise
    - swapped out for 26 inch crest on same hardtail and brakes/instant slight brake rub during out of saddle climbing efforts

    Somehow it does flex.

  17. #17
    Merendon Junkie
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    Frame and rim flex are irrelevant when it comes to the situation you describe. Its either fork, hub or axle flex that is causing your rotor to rub, and of those 3, the fork is the one most likely to flex the most. Did you reset your caliper after you changed the wheels? Im assuming you are using a different hub. It could be that the disk is more to one side with this hub and so its rubbing when you turn only in one direction.

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