Fork Shudder
chris love
cantis? I'm running Tektro CR720's.
CycloFiend
> Anybody have any experience with eliminating fork shudder with
> cantis? I'm running Tektro CR720's.
What fork and what rim? Also, pad material can play a part.
There have been a couple of threads over on iBob list about this (and I
think the BayAreaCyclocross group). Among the common variables is how
extended the posts of the brake pads are. Narrow rims and a good amount of
extension seems prone to this. Of course, as was briefly covered here in
the past week, the "newness" of rim and pad makes a big difference as well.
Assuming you're talking about a higher frequency shudder (more than 3 or 4
per second), rather than a "surging" or stopping related to a specific spot
on the rim.
- Jim
--
Jim Edgar
Cyclo...@earthlink.net
Cyclofiend Bicycle Photo Galleries - http://www.cyclofiend.com
Current Classics - Cross Bikes
Singlespeed - Working Bikes
Send In Your Photos! - Here's how: http://www.cyclofiend.com/guidelines
"That which is overdesigned, too highly specific, anticipates outcome; the
anticipation of outcome guarantees, if not failure, the absence of grace."
William Gibson - "All Tomorrow's Parties"
Tim McNamara
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.
Angus
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
MitchK
On Aug 26, 10:28 am, chris love <melvinl...@gmail.com> wrote:
> Anybody have any experience with eliminating fork shudder with
> cantis? I'm running Tektro CR720's.
after a while, it wasn't there originally.
Drove me nuts. I played with toe-in, pads, cleaning rims, cable
"leverage", etc., all to no avail. I didn't try the fork mounted cable
hanger, but I was pondering it.
It wasn't until I ran across a thread somewhere which suggested
checking headset adjustment. I tightened my headset a bit, and the
shudder was diminished. A bit more, diminished more. One final bit,
and it was gone (maybe a quarter turn or so total). Note that the
headset wasn't theoretically too loose before (based on bearing play)
and I don't think it's too tight now. Still turns smoothly without
binding. For what it's worth my headset is a Cane Crake S-3.
Mitch
Brad
bikes (with Shimano BR-R550's). I bought one of those fork mount
cable hangers a while ago because I changed headsets and wasn't sure
if the hanger would fit. I'm going to try the fork mount hanger and
see if it solves the problem.
Brad