| Why does the chain slip on my mountain bike?

Why does the chain slip on my mountain bike?

Michael S asked:


In most gears, it’s OK, but there is one gear where it slips when I crank hard, and there are a few gears where it will slip continuously. It’s pretty annoying, especially when I bang my knee.

I bought the bike used and I suspect that the back wheel and gearset (is that what it’s called?) aren’t the original ones. How can I check this, and fix it?

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Comments

3 Responses to “Why does the chain slip on my mountain bike?”

  1. soccerdudex759 on May 19th, 2009 12:17 pm

    your derailler hanger may be bent or there could be a broken/bent link in the chain.

    go to your local bike shop and have them look at it.

  2. Jon P on May 19th, 2009 7:57 pm

    same thing happens on my bike man.

    is it one of the old gear shifters w/the lever that you push w/ your thumb?

  3. kayakblack on May 22nd, 2009 4:05 pm

    Change the cassette (or gear cluster) and chain. Sound,s like you have excessive wear on one or both.