Chain falling off chainrings...

ruggedman

Ok, I just began Mountain biking this summer when I came across a fisher HKEK for a good deal. I've been riding this bike all summer for what I would consider moderately rough XC riding. It's now taken the toll on this 8 year old bike. The main concern for me right now is that my chain falls off under power now, not when i'm riding easy flat things, but when I ride rough bumpy terrain and try to apply a lot of power. It's getting worse and my knees are really starting the pay the price. The chain will generally make a nasty noise and pop off what chainring it was on and fall twoards the bike (onto the bottom bracket). I've degreased and regreased everything to no luck. I'm leaning at just getting a new cassette and chain, is there anything else you folks think might be wrong?

Thanks a bunch in advance,
-Andy
Novice XC Rider/Mechanic :-P

Don Shipp

Check the chainrings for wear as well, if they are bad, replace them when you replace the other bits.

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tyler_derden

Have you tried adjusting the L set screw on the front derailleur to keep the derailleur from moving inward any farther than it has to?

What is the condition of the chain and chainrings?

TD

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moparchris

check for bent teeth on the chainrings but you probly need to replace your drivetrain which means chain, cassette, chainrings, replace the derallieur pulley wheels while your at it too.

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