[SauciestGNU]

I have one of these bikes, and the mechanical disc brakes do not outpace the motor. They provide adequate (even snappy) stopping power in every condition I've tested them in. I'm also a qualified bike mechanic and I've done maintenance on my Rad Runner. The factory assembled bits are all properly and well installed, with everything torqued to spec and loctite applied to some threads of hardware that's more permanent.

It's really silly to throw blame around for such a tragic event, but a loose quick release skewer cannot be attributed to anything except user error.