DanGT86
100 kW
Over the summer I was racing my ebike on a kart track and doing repeated hard decelerations from 45 down to 10mph. When I say hard decel I mean as hard as I could possibly brake and stay on the bike. I was butt off the seat in a crouch so low that I actually sat on the rear 24" tire a few times and the brakes were still effective enough to lift the rear wheel off the ground. The bike with me and gear was around 275lbs. Im running 10 year old avid Juicy 7 brakes up front and a junk hayes mechanical GX2 caliper in the rear with DH pads on 203mm standard rotors. Nothing fancy like an aluminum spider or sandwich vented disk just regular solid disk rotors. I know its not the most scientific data but anecdotally I can say that the brakes under full torture mode like this did have some fade but could still provide more grab than the tires or the geometry of the bike could handle. I think you would be skidding or going over the handlebars before you would ever be limited by brake fade with any 203mm setup. The fade is apparent but far from failure condition.