I have a brand new '13 Cannondale CAADX Disc Ultegra 54" There seems to be a premature and destructive grinding going on between the hub locknut and the front fork end when the front brake is applied. Photo below.
A chatter/vibration clued me in, and it's not any normal rotor or assembly chatter. It's a fast repetitive grinding/flexing noise, and when speed is reduced enough, you can actually see the fork ends shudder.
Stopping power is not affected, skewers have always been tight (very tight now) but the noise, grinding, and shudder persist. I'm 6', 185 lbs so I'm not a featherweight, and am wondering if somehow this disc and carbon fork combo just went south.
As I mentioned, it's brand new, and it's been in the hills less than a dozen times. I've removed and inspected the front wheel and rotor less than a dozen times. Rotor is true and the Bengal brakes are fine - but somehow the stresses are transferring and twisting the forkend enough to do this damage. Hub is fine, albeit with some visible wear on the knurling/teeth of the locknut.
Outside side nearest to brake/rotor assembly also has a bit more wear than I'd expect from a 2 month old bike, but nowhere near the hub side of the fork end. Thoughts people?