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check to see if all chain rollers between the links are there.if one is missing then your chain can slip.What are the sprocket teeth like.are they worn?
You may have knocked the gear derailleur when fixing and re-fitting the rear wheel. This can knock the derailleur out of whack slightly and will need proper adjusting by your local bike shop.
your drive sprocket is probably warn out and will tear your drive link apart there fore stretching your chain...you can take out a drive link to give more chain adjustment...but thats a short term fix up as it will stretch the chain again until it snaps...not a pleasent thing to happen to you...i would get a new drive sprocket and a new chain
You will need to first determine what the chain broke. If it is because of where you will need to replace the can with a new on. If it was anothe reason then you have a couple options.If you want to repair this yourself you will need to have a bicycle chain tool. Otherwise your local bicycle shop can reinstall the chain for a very low cost, less then the cost of a new chain tool.
If you are going to install it you can remove the bad link and reinstall the chain, however this will likely make you chain too short.
If you are going to replace the chain:
1. Lay the old chain out completely.
2. Cut the new chain the same length as the old chain. If using the quick link provided then make sure to cut the chain with two male ends and make it one link shorter then the original chain.
3.Start installing the chain from the rear derailleur. Start putting the chain in from the lower pulley(wheel on derailleur). Push over the lower pulley and under the upper pulley. Then back up behind and over the cassette (gears on the rear)
4. Now continue pulling the chain to the front. Go through the front derailluer and down around the chainrings.
5. Connect with the other end of the chain.
6.Use the quick link provided with the new chain or push the pin back into the chain (unless in is a shimano chain, then use the provided new pin)
You may want to take your bike down to a local shop and have them put a chain guage on the chain to see if the chain is stretched... This should be a free service... If the chain is stretched, it will tend to want to jump when under pressure... if this is the case, the chain should be replaced before further damage to the gears occurs...
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