Thread: Why does the chain slip on my mountain bike?

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?

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

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.

same thing happens on my bike man.

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