Best off to take it to the nearest bike shop and speak with a mechanic who will assess the symptoms and tell you what's up. Otherwise it's just pure speculation at this point. In other words there would have to be a lengthy discourse between you and me through trial and error just to get an idea of what your bike looks like. It could be anything from a bent derailleur hanger/or cage to a worn out drive train. I'd rather not guess and freak you out with worst case scenarios, but rather have you speak to someone who can actually see the bike. Good luck!Everytime i pedal my chain sounds like its skipping. How can i fix it?
Move your back tire back it sounds like your chain is too loose
Check the chainring deraileur, go into the gear it starts skipping, and there are litte screws taht adjust how fare that thing moves
It's unclear what you mean by ';changing gears.'; This makes a difference in how I should answer.
Assuming you meant shifting into a different gear while riding in hopes of avoiding the skipping sounds, that is not going to be a long-term solution. In fact, you're only making things worse the longer you ride like that. (See below.)
Assuming you meant that you have replaced the cassette (the whole set of rear cogs, or gears), I have to say that you have gone half way to fixing the problem. You probably have a worn out chain (a likely scenario if you needed to replace your cassette). Over time with many trips through the cassette, the metal in the chain links gets worn down from friction. As that metal is worn down, the distance between your chain links gets bigger and causes the chain to fall on the teeth of your cassette unevenly. This is the skipping sound you describe. The longer this skipping goes on, the more damaged your cassette will become as well, because the loose chain is now torquing awkwardly on the teeth. The teeth then get bent and worn prematurely. If you haven't replaced the cassette, it is quite possible that you will need to. Look for the damaged teeth as I have discussed. If you don't feel qualified to do so, ask the bike shop mechanic. They're usually pretty good about not charging for that sort of thing if its a real quick look-see.
To diagnose this as the problem, go to your local shop and buy a chain checker tool for about $7. (Bring your bike with you so you can do the chain check before leaving the shop, because I'll bet you're going to be buying a chain, too.) Park tool makes a good one I've linked here: http://www.parktool.com/products/detail. Follow the easy instructions on the box. As I said, then get out your wallet again and go buy a new chain appropriate for your bike (8 speed, 9 speed, whatever).
You can't move your back wheel, so don't try that. Unless they make bikes with adjustable dropouts for rear wheels (they don't), your wheel goes in one place only - where the manufacturer put it.
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