Join Date: Jan 2004
Location: where the sunbeams end and the starlight begins
Bikes: Kona Unit, planet X cx bike, khs fixed gear
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Its the headtube mounted brake cable stop that is most likely causing the problem. Carbon forks seem to magnify the problem.
From Lennard Zinn
What happened is that the fork blades and your headtube flexed. Just a little but enough to change the distance between the brake cable stop and the brake arms. This caused the brakes to pull harder. Something had to give, either the tire will skid, the brake pad will skip, or you'll go over the bars and crash. In this case the brake pad skipped on the rim. That released the pressure momentarily the frame and fork flexed back then the pad caught again and the process repeateded. The whole process happens very quickly, many times a second.
Without a fork mounted cable stop there a limited option. Toe in the brake pad, use short pads. Check the canti brake sticky in the cx forum for more info/help.
I switched to mini v-brakes. Problem solved. Wasn't going to get rid on my ritchey wcs fork for one that has a fork mount.
When sadness fills my days
It's time to turn away
And then tomorrow's dreams
Become reality to me