|Prev: Introduction to Chains, Cassettes and Cranksets||Next: Cassette and Freewheel|
| Tools needed:
Replacing a chain is a regular maintenance task. All chains eventually wear out, even if you clean and lubricate them properly. A worn chain, as well as being inefficient, will quickly wear out other drive parts and end up costing you money.
To determine how much a chain has worn, either use a specialist gauge from a bike shop or measure the length of 24 links. If the length is greater than 12in (300mm), the chain is worn.
New chains on derailleur gear systems are linked with a joining pin that comes with the chain. You will need a link extractor tool to make this join. The thicker chains of hub gears, BMX bikes, and some fixed-gear bikes are joined by split links.
Below: Parts of a split-link and a Shimano chain.
Replacing a derailleur chain
1. Shift onto the smallest chainring and cog so that the chain is slack.
2. Thread a new chain through the jockey pulleys and around the biggest chainring and smallest cog.
3. Remove the excess links from the opposite end from the one on which there is a joining link. Leave an inner link so that the two ends can be joined together.
4. Loosen any stiff links that occur when the chain links are compressed during Step 3.
Joining a split-link chain
1. Join the chain by pressing the side of the split link with the pins fixed in its plate through the two inner-link ends of the chain.
2. Push the split pin into the grooves of the split-link pins. These are sticking through the outer plate that you have just fitted. The split pin’s open end should face the rear of the bike.
|Top of Page||Prev: Introduction to Chains, Cassettes and Cranksets||Next: Cassette and Freewheel||HOME|