CYCLING IS A GREAT SPORT

What Is Your Speed

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Why does my bicycle's chain come off the chainring?

I have a new bicycle, one chainring, 5 derailleur gears. Sometimes, when I change to a higher gear (smaller rear sprocket) the chain comes off the chainring. Why is this happening, and how can I prevent it?
Thanks Mr Goodkat, but it sometimes happens between intermediate gears.
Lisaviduko, how do I check whether tension's right?

It might be that the chain is too long for the system that you are using and the tension within the derailleur system is unable to take up the slack at times.

On a multi chain wheel bike, the chain is run over the largest chain wheel at the front of the bike and the largest rear sprocket. This is done without the chain passing through the derailleur system. When the chain is then re-fitted through the gear change mechanisms, the derailleur takes up any slack and tensions the chain.

Other things that you might check.
Is the chain damaged or has a dry link?
Is the chain ring firmly attached to the spider/bottom bracket?
Is the chain ring out of true or bent?
Is the derailleur well attached to the frame?

ROTOR Q-Rings increase power chain rings at twohubs.com

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