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Is there a chain keeper or chain guide available for a single sprocket E bike type frame bike to stop chain from coming of the front single sprocket?

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    There are many types of chain keepers and guides. Can you show a photo of your bike? – Vladimir F May 18 at 21:19
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    Except for fairly techical Mountain biking, chain keepers should not be needed and it would be better to find the root cause of the problem. – mattnz May 18 at 22:08
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If your chain is coming off of the single front sprocket, you probably need to tighten the chain or get a new chain.

Use a chain checker to see if your chain is stretched out and needs to be replaced. If not, some bike frames have a longer space instead of just a single hole where the back wheel can move a bit. Just loosen the back wheel and see if it can move back a bit and tighten it in place. But I'd doubt an e-bike would have that kind of variability.

If none of that works, you may need to ask the bike shop to look it over. There may be many other reasons this is happening.

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