Why does my chain keep coming off my bike?
Most of the time, bike chain keeps falling off can be caused by a the chain itself or bad adjusted drivetrain components, after good riding mileage, the chain will get stretched causing damage to both chainrings and cassette teeth, therefore it loses its good mechanical contact causing the chain to jump from the gear …
When should I tighten my bike chain?
The chain should be tight enough that it only allows you to move it up and down about half an inch. If there is no slack in the chain then it is too tight. And if there is too much slack then you need to tighten that chain.