Immediately replace your mountain bike chain with a new one when it's damaged. But it's possible for a broken chain to be repaired with the use of a chain tool. This is the reason why traveling with a chain tool is what most mountain bikers do.
Your chain has three basic components - the metal side plates, the rollers between the side plates, and the rivets, or pins which go through the rollers and help to hold the plates together. Allowing the rollers to freely turn as the chain moves around the cogs are these pins.
If your chain happens to break, you'll need to remove the broken link and replace it with a spare link. Until you can get it replaced, reattach the two ends of the broken chain and ride on a shorter chain.
In order to remove the broken link of chain, try placing it in the chain tool. The tool should be turned counter clockwise until the chain tool's rivet pin touches the chain rivet. Continue to turn the tool until the pin pushes out of the roller. You have to stop turning when the pin is at the edge of the roller or else it will move through the outer side plate so you need to be careful.
Back it out of the roller once you've turned the tool in the other direction. You then have to set the tool to the side, work the chain gently from side to side and then the inner side plates and roller should be extracted.
Now is the time to re-route the chain through the bike. You may want to have a chain retaining tool or some to help you hold the chain in the right spot as you route and repair it.
You can insert a new link or simply connect the link that were beside the broken one when you've removed the broken link and re-routed the chain. For the link with the inner side plates to fit inside the link with the pin and outer side plates, you need to align the two ends. To push the pin inward, use the chain tool until it's positioned evenly between the side plates.
To actually practice with a chain and a chain tool, the easiest way to learn how to do this or feel comfortable doing it is to have someone show you. Making a temporary repair in a mountain bike chain shouldn't be any trouble when you see how professionals do it and have practiced yourself a few times.
Your chain has three basic components - the metal side plates, the rollers between the side plates, and the rivets, or pins which go through the rollers and help to hold the plates together. Allowing the rollers to freely turn as the chain moves around the cogs are these pins.
If your chain happens to break, you'll need to remove the broken link and replace it with a spare link. Until you can get it replaced, reattach the two ends of the broken chain and ride on a shorter chain.
In order to remove the broken link of chain, try placing it in the chain tool. The tool should be turned counter clockwise until the chain tool's rivet pin touches the chain rivet. Continue to turn the tool until the pin pushes out of the roller. You have to stop turning when the pin is at the edge of the roller or else it will move through the outer side plate so you need to be careful.
Back it out of the roller once you've turned the tool in the other direction. You then have to set the tool to the side, work the chain gently from side to side and then the inner side plates and roller should be extracted.
Now is the time to re-route the chain through the bike. You may want to have a chain retaining tool or some to help you hold the chain in the right spot as you route and repair it.
You can insert a new link or simply connect the link that were beside the broken one when you've removed the broken link and re-routed the chain. For the link with the inner side plates to fit inside the link with the pin and outer side plates, you need to align the two ends. To push the pin inward, use the chain tool until it's positioned evenly between the side plates.
To actually practice with a chain and a chain tool, the easiest way to learn how to do this or feel comfortable doing it is to have someone show you. Making a temporary repair in a mountain bike chain shouldn't be any trouble when you see how professionals do it and have practiced yourself a few times.
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