Chris,

I had a fork shudder issue on my Atlantis.  I my case it was a set of
brakes that had no toe adjustment (other than bending something) and
had a lot of clearance between the cantilever post on the fork and the
bushings in the brakes (loose fit on the studs).

The lack of proper toe adjustment would set up a vibration that was
bad enough to shudder the fork/bike.  I changed brakes, now everything
is happy as can be :-)

I have had incorrect toe settings on other brakes and they generally
just get noisy.

Angus

On Aug 26, 6:26 pm, Tim McNamara <tim...@bitstream.net> wrote:
> On Aug 26, 2009, at 12:28 PM, chris love wrote:
>
>
>
> > Anybody have any experience with eliminating fork shudder with
> > cantis?  I'm running Tektro CR720's.
>
> The problem is the stick-slip cycle.  You can try cleaning the rim  
> very thoroughly, changing brake pads, even changing brakes.  
> Sometimes that works.  The problem lies in the fork legs twisting and  
> flexing, causing the brakes to grab then slip then grab then slip  
> then grab then slip...  Maybe installing a "brake booster" would stop  
> it.
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