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  1. #1
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    First Fork Woes.

    Hi all. So I just built my first cyclocross fork with canti mounts and when braking Im getting some violent brake shudder. It is lugged with a 1" steer tube and 38mm of offset that was media blasted and powder coated. Im pretty fresh when it comes to building forks so I was wondering if there are some common rules I may have over looked or a possible quick fix to remedy it. I have tried different brakes, pads and different wheels. I have toed the pads to the max and that helped a bit but now Im stumped to what to do next.

    Thanks Colin T.

  2. #2
    Randomhead
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    you might try a crown mounted cable stop. Also, many cross riders cut down their front brake pads.

  3. #3
    tuz
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    I experienced braking shudder recently and it was because of a too low mech. advantage on my cantis. Don't know if that will help, but you can try lowering the yoke and make sure you have the proper levers...
    homebuilt commuter, mixte, road and track (+ Ryffranck road)
    bla bla blog

  4. #4
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    Thanks for the replys. I have gone though all the normal fixes of canti shudder. Run the carrier high and low, mounted the cable stop on the fork, headtube and stem, running canti brakes with road drop levers, tried different pads, rim widths and toe. So that is why I am thinking it is a manufacture problem on my part. Could it be a low offset issue? I know most canti forks run in the 45mm area and Im running a bit less than that. I have been a bike mechanic for many years now but a frame builder for much less so I think that is where maybe I am not seeing something.

  5. #5
    tuz
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    Hmm I'll throw a wild guess here, but perhaps the fork is too stiff? Do you have straight blades and a sloping crown? I think shudder occurs when the fork flexes near the crown or bosses during braking, thus tightening the cable below the stop. I'd say with curved or longer blades, chances are the flex will occur below the bosses?
    homebuilt commuter, mixte, road and track (+ Ryffranck road)
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  6. #6
    Randomhead
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    I am not sure how misalignment affects cantis, could be the problem. I can't imagine a fork being too stiff would be a problem, a wimpy fork is a known problem.

  7. #7
    Senior Member bobbycorno's Avatar
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    Quote Originally Posted by tuz View Post
    Hmm I'll throw a wild guess here, but perhaps the fork is too stiff? Do you have straight blades and a sloping crown? I think shudder occurs when the fork flexes near the crown or bosses during braking, thus tightening the cable below the stop. I'd say with curved or longer blades, chances are the flex will occur below the bosses?
    Hmmm.... Could be. My Gunnar Crosshairs had horrendous shudder with Shimano BR550's. 1 1/8" steerer, cast full-sloping crown and curved blades. My Kogswell P/R has no trace of shudder: 1 1/8" steerer, cast flat top crown, and LOOOOONG curved blades (like enough vertical clearance for 50mm tires and fenders!). So maybe the flex is better distributed in the P/R fork?

    SP
    Bend, OR

  8. #8
    Senior Member miamijim's Avatar
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    Try the fork on a different frame.
    WWW.CYCLESPEUGEOT.COM 2005 Pinarello Dogma; 1991 Paramount PDG 70 Mtb; 1976? AD Vent Noir; 1989 LeMond Maillot Juane F&F; 1993? Basso GAP F&F; 1989 Terry Symmetry; 2003 Trek 4700 Mtb; 1983 Vitus 979

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