There's no getting away from it: having your ride halted by a time-consuming mechanical is a extremely frustrating. But the sense of achievement from fixing problems yourself and getting back in the saddle is huge – and it always makes for a memorable ride.
Knowing how to fix a broken chain yourself is an essential skill. As well as saving your ride, you could be in a place where it's very difficult to call for assistance. Our friends at Bicycle Maintenance Guide put together some tutorial videos and a 10-step guide below to show us how it's done. You can find tips for other mechanicals in our Spotlight on essential bike maintenance and the repair skills you need for bikepacking and cycle touring.
Recover the snapped chain.
Using a chain link extractor, remove the snapped links from either end of the chain. Make sure you leave an open link with the pin still connected on one end of the chain and a closed link on the other end.
To leave an open link at one end of the chain, use the chain link extractor tool to push the pin out of the chain, but don’t push the pin all the way through and out of the chain. As the pin is being pushed out, the resistance of pushing the pin will increase, at that point stop as this means the pin is within the outside plate of the chain.
On the closed link end of the chain, the pin can be pushed all the way through.
Thread the closed link end of the chain through the rear derailleur, around the cassette in an S (making sure it's underneath the guides) and over the chain rings. The closed end of the chain has to be threaded as the open end has the pin connected to it so won’t thread through the rear derailleur.
With the chain threaded through the derailleur and cassette, let the chain sit over the bottom bracket inside of the front chain rings. This allows slack in the chain which will be needed when joining the chain.
Push the open and closed end together. There should be enough of the pin protruding on the inside of the chain plate on the open link, that the pin should hold the closed end in place.
Using the chain link extractor tool again, push the pin through the centre of the closed end link and through into the other side plate of the open end link. This completes the join of the two ends of the chain.
The joining link could be very stiff, to loosen the link, bend the chain side to side to free it off.
The chain is now connected and you would be able to cycle home. However, it has to be remembered that the chain has been shortened which means there will be certain gears that the bike won’t be able to run in. Mainly the large chain ring when combined with the easiest couple of gears on the cassette. To solve this problem, you can carry spare chain links in your saddle bag, simply replacing the broken link.
Once at home replace the shortened chain for a new chain which is the correct length.
Alternatively, there is another way of connecting a chain. Quick links can be bought which will connect two closed ends of a chain together. This method is much quicker and simpler. We would recommend always carrying a quick link in your saddle bag.
This content is brought to you by Alpkit and our friends at Bicycle Maintenance Guide. They have an app which makes a complete bike maintenance course.
Apple app - https://apple.co/2PFkqMT
Android app - bit.ly/2wOwWCM
This repair has been carried out on a component from a popular brand. If you are using a different component please refer to the manufacturers manual to ensure specific details of the component/task are known. The principles and general skills of the task can be transferred but maybe not the exact details.