Mad Mike
Well-known member
You might be scaring him out of trying this service. Changing a chain and sprocket set is basic stuff - easier than changing a bike tube or tire.The Motion Pro tool i linked to tells you if the chain is coming off the sprocket straight.You can also buy one that uses a laser pointer.Works even better.
You don’t need lasers or micrometers, use the index marks on the tensioner, and verify visually by rotating the wheel while on the center stand.