Specialized Diverge, Flex and Rotor Rub
10-30-15, 02:22 AM
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Specialized Diverge, Flex and Rotor Rub
I just recently purchased a Specialized Diverge X1 (SRAM Force 1 group) which I have been dialing in and have maybe put 50km on it to-date. One thing which is bothering me is that when I get out of the saddle and hammer on the cranks, I am getting what I believe to be flex, leading to my disc brakes rubbing the rotor (I hear the rub). I am not a lightweight (about 190lbs) but I am also not excessively heavy yet I am a strong rider. Considering it's a carbon frame and fork I wasn't expecting it to be so flexy. Could it be that my discs are set up incorrectly, leading to the rub instead of it being that the frame is flexing? I do not know whether there is a way to "adjust" spacing on the discs. Any help appreciated.
Last edited by pjozefak; 10-30-15 at 02:40 AM.
10-30-15, 03:21 AM
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Unless the caliper isn't centred on the rotor (pretty easy to do, loosen the caliper bolts, apply the brakes hard, and re-tighten) It will be the rotor which is slightly warped (pretty common) rather than the frame being flexy. This can occur under breaking, then the next braking removes/fixes it.
10-30-15, 03:37 AM
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Jim, thanks for tip. Can it be though that a basically new rotor is warped if the initial proposed solution doesn't work? I would doubt that SRAM would deliver warped rotors to manufacturers.
10-30-15, 04:48 AM
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No mechanical part is perfect, and rotors can warp due to heat after installation; one hard stop could do it. A warped rotor can be straightened, mostly. Likewise with the frame and fork, nothing is 100% rigid. Isn't one of purported advantages of carbon the ability to "soak up" impacts? It does this by flexing slightly.
10-30-15, 04:50 AM
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It's not that they are shipped warped, but warp under braking, some brands are more susceptible than others.
10-30-15, 04:54 AM
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I'll have to check that out although I am presuming I haven't warped it while braking. Only two short rides thus far to get used to bike and dial in setup. Didn't do any hard stops or anything along those lines. Will check nevertheless. Many thanks.
10-30-15, 07:10 AM
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As already said, the warping will be very small, it will probably imperceptible to the eye unless looking close, next time you ride it, when you hear the rub, hit the brakes, and it should go away.
