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It always happens at the worst possible moment: you turn onto the flow trail, start pedalling – and suddenly the crank spins freely. The chain’s in the mud. The bike’s at a standstill. So are you. What now?
We’ve all been there: the perfect day out on the trails, somewhere deep in the woods, five kilometres from the nearest car park. And then this happens. A dry snap, a brief moment of weightlessness as you turn the cranks – and then the rude awakening. A broken chain. Welcome to the club of involuntary push-it-home rides.
That said, the situation doesn’t necessarily have to end in disaster. If you’re prepared, you can have your bike back on the road in ten minutes.
Why does a chain break in the first place?
Before we get to the repair guide, a quick word on the cause: a modern 11- or 12-speed chain is a precision component made from an alarmingly small amount of material. The links are paper-thin, the rivets delicate. Combine that with a worn cassette, a warped rear derailleur or a vigorous burst of power whilst overtaking on an uphill section, and a break is only a matter of time.
The most common culprits:
- Excessive wear (chain elongation of more than 0.75 per cent)
- Switching faults under load
- Damaged or poorly fitted chain rivets
- A faulty quick-link that has come undone without anyone noticing
It’s all down to the tool
This is where the wheat is separated from the chaff – or the rider with a mini-tool from the one without. You can find a selection of useful mini-tools here.
The absolute essentials for a hiking rucksack:
A Chain tool (or a multi-tool with a built-in riveter) and a Quick Link Suitable for your own chain size. This isn’t a luxury, it’s a must. Anyone who argues that it’s too heavy or unnecessary may well end up having to push the bike.
The repair – step by step
2. Remove damaged links Use the chain tool to remove the damaged link (or links). Never reuse an old rivet! Once the rivet has been pushed out, it is no longer fit for purpose.
3. Set up a quick link Join the two ends of the chain, attach the quick-link, give the pedals a quick turn – and let it click into place. Sounds simple, provided you’ve got the right link with you. 12-speed quick-links won’t fit on an 11-speed chain.
4. Check the chain length A shorter chain means: take care when shifting to the larger sprockets. If in doubt, stick to the small chainring and the middle cassette positions. It’s better to cycle home with a limited range of gears than with a broken chain in the rear derailleur.
A quick fix: Singlespeed repair
Forgotten your quick-link? Left your chain tool at home? Then it’s time to get creative. By removing enough links, you can shorten the chain so that it runs in a fixed gear – without a rear derailleur. Secure the derailleur with a cable tie or simply unhook it, then tension the chain on a medium-sized sprocket.
The real lesson
A chain break is rarely an accident. It’s usually the result of something else. For insufficient maintenance, changing the chain too infrequently, or shifting gears too aggressively under full load. The chain is the most neglected wear part on a bike – yet it’s the only one that transfers the power from your legs to the trail.
Rule of thumb: Check the chain every 1,000 to 1,500 kilometres. Replace it if it has stretched by 0.5 per cent. If you wait until it has stretched by 0.75 per cent, you’ll soon be out of pocket for a new cassette.
And: Always set off with a quick-link and a multi-tool. These are essential items – not optional. Just like a helmet and protective gear.
Backpack checklist
Do you have a better trick for that singlespeed stopgap solution? Bring it on. The best trail hacks come from the community
Barbara Merz-Weigandt
Editor-in-Chief