How To Tighten A Bicycle Chain?

Depends a bit on what kind of bike you've got. If it's a single-speed or an internally geared bike and the frame has horizontal dropouts - then you unbolt the rear wheel and slide it backwards until the chain is taut again. Check alignment, tighten the wheel nuts and you're done.

If it's a BMX it might have chain tensionser which you have to reset while you're at it If chain wear is really bad you might not have enough reach in the dropouts to get the chain tight again. Then you have to shorten the chain by one link first, and then set the rear wheel up again. There are even special half links that can be used for this purpose If your bike has vertical dropouts, then you either need to use an extra little sprocket as a chain tensioner, or you can try the half link approach there too.

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