Originally Posted by
SimonSan
Much attention is paid to wheel position? huh?
I don't know what level you raced at, but if you were just putting the wheel in and cranking down the axle and pinch bolts, you were doing it wrong. As you know, forks twist, even big fat USDs. Tightening the axle and pinch bolts without aligning and eliminating twist is one cause for pad drag.
the pad is free to do what ever it likes, ?
Exactly. In a hydraulic system using "FULL floating rotors", not semi floating or fixed, the rotors movement (when at speed) will actually push the pads/pistons back enough to eliminate drag.
I can assure you my road motorcycle and my track motorcycle all rub the disc 360 degrees of their rotation
That's an unfortunate consequence of improper setup.
True full-floaters move on the carriers, this allows them to self-center in the caliper for reduced brake drag and "float" unimpeded for unrestricted expansion and contraction during repeated thermal cycling. The only serious down side is a bit of rattle that reminds you these are indeed full-floaters.
What is Full-Floating?