- there always seems to be a slight noise-rubbing, certainly on wet/dirty roads
- Very sensitive to wheel alignment. Wouldn't be the first time after a puncture that I have to re-insert the wheel a few times before it spins freely.
I hope this is in the spirit of the thread - not meant to be critical, just curious.
I rented a cross bike with discs last winter and rode a bit on the pavement in Death Valley area of California. It was kind of dusty in that area, but not "dirty" and I didn't ride on trails or gravel roads.
I had kind of chronic, quiet rubbing/rasping/scraping sound coming from the brakes. Quiet - more like a hiss, but definitely audible. The wheels were spinning freely, so I don't think they were adjusted too close. I'd never used disc brakes before so I really didn't know how to adjust this sound out of them. I figured out how to adjust them, yes, but it seemed to me that at reasonable clearance/brake throw, this sound would pop up regularly. I found that I could get rid of it temporarily by just hitting the brakes. I figured that the sound was made by dust between the pads and the disc, and braking cleaned them temporarily.
Like I said this was a quiet sound, but noticeable and kind of bugged me. Is this just the way it is with discs? I would imagine that this sort of thing would be meaningless on a trail - lost in the background noise. But I wonder if it's just something that one would have to accept because of one's preference for disc performance on roads?