You are reading a single comment by @TM and its replies. Click here to read the full conversation.
  • forget the term

    Chatter.

    My brother's CX bike chatters like mad if you brake gently, but it's fine if you stand it on its nose. I expect you have the same issue with wet braking, except that you can't brake harder because you don't have the reserves of friction due to the water. Sometimes the chatter can be traced to too much free play in the brake centre pivot (or C-arm pivot if dual-pivot) or free play in the headset. Other times you can have everything perfect and it's just the combination of rider weight and fork stiffness (or lack thereof, with 1" steerers) which just refuses to play nicely.

    While the chatter doesn't have exactly the same root as it does on a CX bike, I wonder whether the brake track on an old CXP30 without UB Control is sufficiently far off parallel that the effective change in fork length as the fork bends backwards could create the same brake servo effect by an inclined plane action. It would certainly be worth slinging a modern machined front wheel in there as a control.

  • I had to wait for a damp commute to test this, I didn't expect it to make a difference but it seems to have fixed it.

    I had the brake setup so there was fairly little lever throw, I slackened the cable a bit, giving more throw, and it seems to have resolved it.

    But there are other variables, I rode the bike down a very big hill during the week dragging the brake a bit, which may have served to bed it all in and could have also been what fixed it.

    Either way, relieved.

About

Avatar for TM @TM started