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Question for owners of road bikes with disc brakes

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Question for owners of road bikes with disc brakes

Old 04-26-14, 03:58 PM
  #1  
RoboCheme
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Question for owners of road bikes with disc brakes

I've had my disc brake-equipped road bike for about a month now. I like how it allows me to descend on a more leisurely pace with my hands on the hoods.

However, I'm experiencing one problem. When I use the front brakes at over 20 mph, the fork vibrates a lot. When I get below 20 mph, the vibration stops. There is no problem with the rear brakes. The brakes are Shimano R-785.

There's a thread about this in the Mechanic's Forum so at least I know that I am not alone. (no solution, apparently)

Anyone else have this problem? If so, was there a solution?

Thanks,

Cliff
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Old 04-26-14, 04:07 PM
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dalava
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Never had the same problem with Volagi with Avid bb7 road disc.
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Old 04-26-14, 04:47 PM
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The Avid bb7s on my winter/gravel/rain/do everything bike have never caused any problem like that. There have been other issues, and I'd never recommend a disc setup for a normal road bike, but fork vibration isn't a problem.
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Old 04-26-14, 05:20 PM
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i have fork vibration on one of my bikes, an aluminum Kinesis fork. it's pretty much benign thing. i suppose i could get a different fork and it would go away. trouble is it's a 650c wheeled frame and a 1" steerer with quill stem. i would only switch if i could go full carbon and 1" full carbon 650c forks are as hard to find as hen's teeth.

i would imagine that it is caused by a combination of the fork and the pressure exerted on it by the caliper being attached down near the dropout. IDK really, just a WAG.

it can be annoying though, i admit.
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Old 04-26-14, 05:29 PM
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Hmmm. Sounds like brake-induced shimmy. At speeds of just over 20 mph, that's not good. Check that the caliper bolts are tight and that the rotors are true (take to the bike shop if necessary for them to check these.) If the shimmy continues once these are checked, you can pretty point it to a manufacturing defect on the fork, possibly the frame. It might be hard to say which. As you already researched, there is no easy solution for this. This should be covered as part of the warranty against manufacturer's defect due to craftsmanship. The bike shop should replace at least the fork, but they might decide to take care of the entire frameset: fork and frame. Good luck!

Last edited by Chris Pringle; 04-26-14 at 11:19 PM.
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