Things You'll Need:
- New mountain bike chain
- Chain press
- Quick link
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Step 1
Mountain bike chains need to be replaced every 1000 miles. Change a mountain bike chain more frequently if you ride often on rough terrain or in mud. Broken chains (even if fixed) may be warped and might damage the entire system. Switch out the chain as soon as you can.
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Step 2
Reduce the new chain's size. Cut it down to the same size as your old chain. Plan to cut it down about three or four inches. Match the links on the old chain. You'll have a problem with peddling and gear switching if your chain is too long.
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Step 3
Lay the new chain beside the old chain on the floor, or just wrap it through your bike to see how it will fit. Compare the number of links. Keep in mind that your old chain is stretched some from riding. The chain is the correct length when you have it threaded vertically and it still has bending room.
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Step 4
Look at how the ends need to fit together before you break the new chain. Face an end outer link toward an end inner link if using a pin. Use two inner links, though, if you're using a Quick Link (or Quick Connect Link) since it works as an outer link to join the chain.
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Step 5
Route the chain across the cog at the rear, and pull it down and across the top and in front of the upper pulley, then down, across, back and under the bottom pulley. Make sure it's not dragging across the metal support strut.
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Step 6
Push a pin out from the bushing if using a pin replacement method. Use a breaking tool--chain press. Push the pin out completely if you're using a Quick Link to replace a mountain bike chain.
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Step 7
Use a wire or a retaining clip or have someone hold the chain (if necessary) while you assemble it. Use a Quick Link chain replacement or change out easier.
