>>1201413The clutch in the derailleur just helps to prevent chain slap over rough terrain. It doesn't help keep the chain on at all. That's all the derailleur spring tension, chainring and chain guide.
If these guys can do 50 foot drops without their chains falling off then there's no reason why a road bike should on smooth pavement. That's a bad bike mechanic or not throwing on a 10g chain guide if shit hits the fan.
