Answer :
helpful ways: braking - it makes the wheels slow down faster, friction from the chain
harmful: when you fall and slide across the ground, when you get your leg stuck in the chain
harmful: when you fall and slide across the ground, when you get your leg stuck in the chain
It is good because it helps with brakes and stop faster
and bad i am think but i hope the good worked
and bad i am think but i hope the good worked