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If it has derailers the ends stops may not be set properly, allowing him to shift the chain past where there isn't a sprocket to carry it. It's a 2 minute fix once you've figured out which screw to turn. If it hasn't got any external gears, then the chain is probably too slack. Start with seeing if the rear wheel can be shifted backwards to tighten the chain. If the wheel is already as far back as it will go you have no other option than to cut a link out to tighten the chain.

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Q: Why does my sons bike chains fall off so frequently?
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