Chain Checker
This is a device that basically tells you when your chain is worn to the point of replacing or so worn that you may need to think about replacing the chainrings as well.
Chain Checker Tutorials
How to Check If Your Bike Chain is Worn Out
Chain wear can definitely affect your ride for the worst and can cause an accident. They wear out as a result of the rivets being pulled on by the outer plates. It’s what they call a chain...
Type: Repair Tutorial