I was riding my bike at the skatepark and I fell and smacked my derailler on the coping in a mini halfpipe. Then after while I was riding, the chain started to skip on the cassette and almost switch gears without me pulling the trigger. I noticed after that my derailler had me riding in the wrong gears.(I have an 8 spd cassette and derailler) Example: my shifter said I was in the 8th gear but my chain was on the 7th. What is the problem and how do I fix it?
P.S. Just by looking at it, I can't see anything wrong with my derailler hanger. I' m pretty sure it isn't bent.
It sure sounds like a bent derailleur/hanger to me as well. Take it to your local bike shop where they'll have a derailleur alignment gauge to check and straighten your hanger. If it's your derailleur that's bent, that's harder to straighten; you may need a new one.
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