I'm running a Kinlin XR270 (laced to a WI H3 front hub, 20H with DT Revs) on a Specialized full carbon fork. I get brake shuddering at high speeds under light to moderate braking force. So I'm wondering, do I risk damaging the fork or headset bearings with this shuddering? I'm also concerned that I'm riding 3 Peaks - and there's going to be some gnarly descents which would require heavy braking. For safey's sake, do I need I rectify this problem by either getting the wheel rebuilt on a new XR270 rim, or borrow a Ksyrium front wheel off a mate?
There are many things that can cause shudder.
Cielo by Chris King Cross Racer
If yours is like mine (usable) then maybe run some wet weather or more abrasive pads to smooth them out a little quicker. That might work.
Edit...another thing to double check is the brake nut. Make sure it's tight.
You can stick a medium grit emery cloth between the pad and rim and rotate the rim a few turns, it helps clean up the machining ridges that can contribute to shudder.
I tried my wife's Bontrager wheel on my CAAD and did some tests of feathering, medium and hard braking: no shuddering.... I'm pretty meticulous with the toe and alignment of my brake pads, so I know they're all good. All my bolts are tight and my headset is preloaded too.
Sounds like it's the dam rim's fault....
the things i checked were....
quick release tightness
brake toe in-ness
it was eventually.... headset looseness, due to a couple of reasons. Didn't have a microspacer at the time so the top cap was either not compressing the stem enough, so the headset was either binding, or allowing for too much play. Also my stem wasn't torqued enough allowing for a loss of compression.
Geoff wrote:Can you tell us a bit more about the set-up? What brake calipers are you running? How heavy are you? Have you checked the headset?
I'm running 2011 SRAM Red calipers with black Kool Stop pads - plenty of meat left in them. I'm a meagre 64kgs and my headset is all preloaded and the stem all torqued to 5nm...
Zen Cyclery wrote: Check brake toe. The pads could also be glazed over which may cause resonation.
Yep, I've checked the brake pads and they're toed in and not glazed
Pain999 wrote:The rim could just be bad but if you don't have a warranty you might be able to fix it. If you run your fingernail over the rim where the two ends are joined you will likely find a edge where they they don't perfectly align together. If you file or use a sharpening stone to smooth it out the shudder will be greatly reduced and as the rim wears it will gradually go away.
I thought the same thing, but the rim join is actually pretty smooth!
Thanks again for everyone's great suggestions. I think I'll just have to bite the bullet and get a new rim. I've read (just after I bought the rim to be built) that it isn't an uncommon problem. Would it pose any dangerous problems to my full carbon Specialized fork? I can see it flexing back and forth a bit under medium braking (That's 'flexing' not rattling due to loose headset )
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