* Insufficient (infrequent) or the wrong type of chain lubricant
* Particularly dusty/sandy or wet track. That can also occur through hitting too many kerbs with the chain, it throws concrete shards into the chain and thus files away the drive sprocket.
* poor chain alignment (left/right)
* poor chain adjustment (tight/loose)
* Old, nasty or poor quality chain
* Too few teeth in contact with chain: too small drive sprocket, too short chain, too large DRIVEN sprocket
* finally, it IS a 'consumable' like oil, fuel, brake pads, clutch shoes, etc.
* Finally.... finally..... a bad batch of drive sprockets........ that never got 'tempered' properly.
Ian
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