Originally Posted by
seau grateau
So if disc rotors can't cut like that, what sharper thing on the bike did?
I've seen similar casued by soccer cleats, so basically... most of the nuts on a bike, QR/TA, brake/shift levers, the race course itself. (EDIT: Oh, and the cleats some riders attach to their shoes--I'm not talking about the pedal cleats--I'm talking about the soccer/football/rugby cleats that screw in at the toes.)
But what makes me doubt the disc is because you pretty much need to stick your limb through the spokes to contact the rotor.