How to Shorten a Bike Chain

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If your replacement bike chain is too long for your bike, you'll need to adjust it first for safe riding. Chains will also "stretch" over time, but do not shorten the chain to address this issue. Stretching is a sign of wear, and once your chain exceeds the recommended maximum on a chain stretch gauge, it needs a full replacement.

Part 1
Part 1 of 3:

Removing the Chain

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  1. Count out 12 links, and measure them from the first pin to last pin. The distance between those pins should be 12 inches (30.48 centimeters). If the distance is more than 12 1/8 inches (30.80 centimeters), then you need to replace the chain. This is because pins are wearing out, lengthening the chain. [1]
    • If the distance between the 12 links is correct, and you have an older bike, consider loosening the back wheel and pulling it back. This may take up enough of the chain's slack to fix the problem.
  2. This tool pushes the pins out of your chain to allow link removal. If you know the make and model of your bike chain, you may prefer to track down a specialized tool for that specific chain.
    • Some chains, notably most higher-end Shimano and Campagnolo models, also require a special reassembly pin. You cannot put the chain back together without this pin, so make sure you have the right part before you get started.
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  3. If you do not have a bike stand, lean it against something sturdy, preferably upside down. This will make it easier to remove the chain.
  4. Use a high-quality, biodegradable chain cleaner or isopropyl alcohol to dissolve any dirt or grease. This will make it easier to handle the chain and find the master link. [2]
  5. Your chain may or may not have a master link. The master link is easy to spot because it is usually slightly lighter/darker than the other links on the chain. It may also have protruding pins inserted into a special outer plate. This plate typically has an oversize, oval hole around one or both pins.
  6. 6
    Rotate the pedals until the master link is between the front and back gears. This will make it easier to access. If your chain does not have a master link, you'll have to use a chain tool to break the chain.
  7. There are many designs of master links. Some swivel to allow the pin to slide out, while others open up when flexed. Some master links are also disposable, and can only be removed by bending them apart with needle-nose pliers or a specialized tool.
    • Check the side of the chain to find information about the make and model. Visit the manufacturer's website to find model-specific information about the master link.
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Part 2
Part 2 of 3:

Shortening the Chain

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  1. It's better to take off too few links at first than to take off too many. It'll be easier to take off an extra link or 2 than to add several links back on. [3]
  2. Start at the end of the chain not attached to the master link. Hold that link in place with a vise, or use the clamping mechanism on your chain tool if present.
    • If your chain does not use a master link, start with any link on the chain.
  3. Line up the punch on the tool over the link's pin. Slowly turn the handle on the chain tool clockwise and stop when the pin is clear of the outer plate but still attached to the link. Do not push the pin completely out of the link!
    • In many cases, you will not be able to replace the pin if you push it completely out of the link. However, some manufacturers (including Shimano and Campagnolo) make replacement pins, but not all pins are compatible with all chains.
    • If you did accidentally push the pin all the way out, you may be able to slide the pin through the center of the link. Use the chain tool to remove the upper part of the joining link then slide the pin back through the link until the top of the pin is flush with the center part of the link. Replace the top part of the link, then use the chain tool to push the pin back up. Adjust the adjacent pin as necessary.
  4. Move on to the other pin in the same link. Push this out far enough that you can lift away one of the outer plates, followed by the central piece attaching it to the next link.
  5. Only remove the minimum number of links to make your chain work -- generally less than 5. The more you shorten the chain, the more stress you'll put on the links.
    • As before, leave the pins partially attached and set aside all components.
    • Consider saving the chain links you are removing for future repairs. [4]
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Part 3
Part 3 of 3:

Reassembling the Chain

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  1. You may need to use some pliers or a screwdriver in order to do this. Push the 2 links together until you feel the pins click into place in the inner link.
    • If your chain has a disposable master link or special pin, you'll need a replacement part to reattach the chain. Most of these special pins come in 2 parts that enter from opposite sides, but it's best to look for model-specific instructions.
  2. Place the 2 links back into the chain tool's outer slot. Make sure that the pins are facing toward the chain tool's pin. Turn the handle counterclockwise. As you turn, the chain tool's pin will start pushing the pins back through the link. Keep going until you can see a small portion of the link from the other side. The chain pin should be sticking out the same amount on both sides of the link. [5]
    • If you have a quick-release link, you may need a pair of pliers in order to replace it. [6]
  3. 3
    Reposition the pin, if necessary. Sometimes you'll need to work the chain from side to side to reposition the pin. To do this, grab either side of the stiff link tightly and gently work the chain perpendicular to its rotational direction until the link loosens.
  4. This will increase the chain's lifespan and flexibility. It will also improve shifting performance, and reduce wear on derailleur assemblies and drivetrain cogs. [7]
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Community Q&A

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  • Question
    How do I take my chain off if I don't have a master link?
    Community Answer
    You will need a chain tool. Push any pin with the chain tool, but don't push it all the way out or it will be really hard to get in again. Push it so that it will stay in the outer plate; to release it, twist the chain slightly. It should come off. If it doesn't, push the pin little bit more and try again. To re-attach the chain, just push the pin with the tool. Make sure you don't have any pin sides sticking out. (You can compare with the other links to be sure.)
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  • Question
    How can I shorten my bicycle chain without a universal chain tool?
    Mr c
    Top Answerer
    You could try using a hammer and a nail to push the pin out, but it's tricky and might damage the chain. Another way is using a small bolt and some washers to press the pin out. Just be careful not to bend or break the chain. If you're in a pinch, you could ask a bike shop to do it for you. They have the right tools and know-how.
    Thanks! We're glad this was helpful.
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      Tips

      • If the chain is too tense, move the derailleur forward. This will slacken the chain. [8]
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      • If you need help, don't hesitate to go to a bike shop for advice. They won't charge you for that, and they may even recommend several community bike groups to you.
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      • Some people will recommend using a hammer to pop the pin out. This is not a good idea, because you'll be more likely to push the pin all the way out.
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      Warnings

      • Don't push the pin all the way out.
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      • If you do not have the appropriate replacement part, don't rely on makeshift solutions such as forcing the pins in by hand. This may get you home if your chain breaks on the road, but it is unstable and dangerous in the long run.
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      Things You'll Need

      • A chain splitting or separating tool
      • Master link or replacement pin (for some models)


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      References

      1. ↑ https://www.youtube.com/watch?v=cN8zV-Ucsw4
      2. ↑ https://www.youtube.com/watch?v=cN8zV-Ucsw4
      3. ↑ https://www.youtube.com/watch?v=cN8zV-Ucsw4
      4. ↑ https://www.trails.com/how_100_shorten-bicycle-chain.html
      5. ↑ https://www.youtube.com/watch?v=cN8zV-Ucsw4
      6. ↑ https://www.bikeride.com/quick-release-chain-link/
      7. ↑ https://www.trails.com/how_100_shorten-bicycle-chain.html
      8. ↑ https://www.trails.com/how_100_shorten-bicycle-chain.html
      9. Videos provided by Midpacific Exploratory

      About This Article

      Article Summary X

      Before you shorten your bike chain, measure a section of 12 links from the first pin to the last pin. If the section is more than 12 1/8 inches, the chain has stretched and you need to replace it. If the section hasn’t stretched, mount the bike on a bike stand and remove the chain. Use a universal chain tool to push a pin most of the way out of the link. Repeat for the second pin and remove the link, then continue for as many links as you want to remove. Push the 2 new ends of the chain together until you feel the pins click into place, then reconnect the chains with the chain tool. To learn how to remove a bicycle chain, read on!

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