My chain has come off, how do I put it back on?
The chain should wrap around:
01 - The sprocket on the rear wheel.
02 - The chainwheel.
03 - The chain tensioner fixed jockey wheel
04 - The chain tensioner arm jockey wheel, and
05 - The rear swing arm fixed jockey wheel.
The chain has been designed not to fall off but it is useful to remember how to set it up properly in case it does.
Excessive wear and chain stretch mean the chain will damage the teeth of the gears on the drive train, requiring an expensive replacement, so check chain wear regularly with a chain wear tool!
The chain should be replaced every 2,000 to 3,000 miles (or 3,200 km to 4,800 km).