What do you use to take a chain link off your bike?

Answer 1

Depends on how they're mounted. Usually it's one bracket on the seat tube, one under the bottom bracket and one on the right seatstay. The seatstay is usually a wraparound clamp. Loosen the screw, pry it open, and off it comes. The one at the bottom of the bottom bracket shell is usually screwed in both the shell and the chain guard. The one at the seat tube might be welded to the frame, but screwed to the chain case.

Answer 2

all you have to do is loosen the nuts on the back tire simple

Answer 3

To prevent the oily and dirty chain from getting anythin else dirty, and to protect the chain from road grime.