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How to Fix Your Sprocket if the Chain Keeps Coming Off

It's important to immediately fix your bicycle's chain tension and sprocket if the chain keeps coming off. If the chain only rarely comes loose, it doesn't necessarily mean your bicycle is in poor condition -- the chain can sometimes fall off for no obvious reason. However, the bicycle chain falling off frequently is dangerous and a sign that something on the bicycle needs fixing. Regularly checking and adjusting the bicycle's sprocket and chain tension will help reduce the chance that the chain will fall off again in the near future.

Things You'll Need

  • Crescent wrench
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Instructions

    • 1

      Turn your bicycle upside down and place it flat on the ground.

    • 2

      Loosen the bicycle's two rear bolts, which are adjacent to the rear sprocket, with a crescent wrench. The bolts only need to be loose enough for the wheel to freely move around.

    • 3

      Maneuver your bicycle wheel horizontally so it's aligned with the middle of the frame. If the wheel is too far to the left or right, the sprockets won't line up properly.

    • 4

      Slide the bicycle wheel backwards slightly, away from the front of the bike. Test the chain tension by gripping it with your hand and moving it up and down. There should be a small amount of give in the chain's tension. If the chain is too loose, it'll fall off the sprocket. If the chain is too tight, it'll be noisy and cause extra friction, which will slow down the bicycle. When you spin the pedals, there should be little to no noise.

    • 5

      Tighten the bicycle's two rear bolts and flip the bicycle back up into an upright position.


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