Troubleshooting · Cycling
Getting home: fixing a bike at the roadside
Almost everything written about bicycle repair assumes a stand, a full toolkit and unlimited time. At the side of a road you have none of those, it is probably raining, and the goal is not a correct repair — it is getting home without ringing anybody. That is a different problem and it has a different set of answers. This covers the faults that genuinely end rides, how to tell them apart in thirty seconds, and the bodges that are good enough to ride on and honest about being bodges.
Bicycle maintenance and roadside repair look like the same subject and are not. Maintenance happens when you have chosen to do it, with the bike at chest height and every tool to hand, and the aim is that the bike is right. Roadside repair happens when the bike has chosen for you, with whatever is in a saddlebag, and the aim is only that the bike is rideable.
That changes the answers. A bodge that would be unacceptable in a workshop — a chain two links short, a brake backed off so a buckled wheel clears it, a gear locked out — is exactly right at the roadside, because the alternative is a lift home. The important skill is deciding quickly which category a problem is in: fixable, bodgeable, or done.
It also changes what is worth carrying, which is the one preparation that makes all of this possible. A saddlebag that has not been opened since it was packed is the commonest reason somebody with the right knowledge still walks.
- The aim
- Rideable, not right
- Ends most rides
- Punctures, by a long way
- Second commonest
- Gear or hanger, not the drivetrain
- The real preparation
- Checking the saddlebag
- Two tubes, or one and a plug kit — The single highest-value thing in the bag. Two, because the second puncture of a ride is far more likely than the first — whatever caused the first is often still in the tyre.
- Tyre levers, plural — Cheap, light, and one is not enough on a tight tyre. Plastic rather than metal on carbon or alloy rims.
- A pump you have actually used — Mini-pumps vary enormously and some are close to useless at road pressures. Try it in a kitchen before trusting it. CO2 is faster, lighter and finite, and it is a bad companion to a tube you may have to fit twice.
- A multi-tool with a chain tool — The chain tool is the part people leave behind and the part that turns a walk into a ride. Check that it fits your chain’s width before you need it.
- A quick link for your chain speed — Weighs nothing, costs a couple of pounds, and is the difference between a snapped chain being a ten-minute job and being the end. They are not interchangeable across speeds.
- A short strip of duct tape and a zip tie or two — Wrapped around the pump rather than carried as a roll. Between them they hold a mudguard, a cut tyre casing or a light back on.
- Something to boot a tyre with — A folded note, a gel wrapper or a proper tyre boot. A cut in the casing will push the new tube straight back out through it, and this is the failure people do not anticipate.
- A phone, money, and the honesty to use them — The last resort is a legitimate tool. Knowing when a problem is done is a skill, and walking two miles is better than riding a bike that is about to fail differently.
Step 1: Get off the road first
Before anything else. A repair done on a verge takes the same time as one done in a live lane and is a different proposition entirely.
Step 2: Find what caused it before fitting the new tube
The step everybody skips and the reason the second tube goes flat within a mile. Run a finger carefully round the inside of the tyre — carefully, because you are looking for something sharp — and check the outside too. Flint and glass frequently stay in.
Step 3: Match the hole to the tyre
Line the tube up with the wheel and the position of the hole tells you where in the tyre to look. It takes ten seconds and it is the difference between finding the cause and hoping.
Step 4: Boot any cut in the casing
If you can see daylight or the cut is more than a couple of millimetres, put something between tube and casing. Without it the tube bulges through and fails again almost immediately.
Step 5: Fit the tube with a little air in it
Just enough to give it shape. It stops the tube twisting and stops it being pinched under the bead, which is the other reason a new tube fails instantly.
Step 6: Get the last of the bead on without levers if you can
Work the slack round to the opposite side of the wheel first. Levering the last section is where tubes get pinched, and a pinched tube is a puncture you made.
Step 7: Inflate to something reasonable and check the bead is seated
A tyre sitting unevenly will thump. Deflate and reseat rather than riding it.
- Tubeless, when the sealant does not cope — Most small holes seal themselves and you may not notice. For one that does not: a plug from the outside, without removing the tyre, is the intended repair and works well. If the plug will not hold, fitting a tube is the fallback — take the valve out first, and expect to get sealant on everything.
- A repeated flat with no obvious cause — Look at the rim tape. A tape that has slipped exposes a spoke hole, and it punctures every tube you fit, always in the same place on the inner side.
- Two flats and one tube left — Patches are for this moment. A glueless patch is quick and unreliable in the wet; a traditional patch works and needs the tube dry and the surface roughened, which takes longer than you want and is still faster than walking.
- Gears suddenly shifting badly, especially after the bike fell over — Check the derailleur hanger before touching a single adjuster. It is a soft aluminium part designed to bend so the frame does not, and a bent one makes every gear index wrongly. Look from behind: the derailleur cage should hang parallel to the sprockets. If it does not, that is your problem and cable adjustment will not fix it.
- Gradually worsening shifting over weeks — Usually cable stretch or friction. The barrel adjuster at the derailleur is the roadside fix: turn it a quarter-turn at a time towards the direction you want the chain to move more easily, and test under light pedalling.
- A snapped chain — A quick link and a chain tool make this a ten-minute repair. Remove the damaged links, join with the quick link, accept that the chain is now shorter and do not use the largest sprocket with the largest chainring. If you have a chain tool and no quick link you can rejoin with a pin, and it is weaker — ride gently.
- A chain jammed between chainring and frame — Almost always fixable by hand and rarely damaging. Do not lever it out with a tool against a carbon frame. Backpedalling gently while easing it free usually does it.
- It will not shift into the largest sprocket, or it goes into the spokes — A limit-screw or hanger problem, and the second version is serious — a derailleur pulled into the rear wheel destroys itself, the wheel and often the hanger. If it looks close, wind the limit screw in until it cannot reach and ride home in the remaining gears.
- Electronic shifting that has stopped — Battery, almost always, and a charge state you could have checked at home. Some systems will hold the rear derailleur usable by disconnecting the front. Otherwise it is a single-speed and the gear it stopped in is the one you have.
- A broken spoke — The wheel goes out of true immediately and may rub the brake or the frame. Wind the broken spoke around a neighbouring one so it cannot flail into anything, open the brake or back it off, and ride home gently. A wheel with one broken spoke is usually rideable; one with several is not, because the rim is no longer being held in shape.
- A buckled wheel after an impact — Same answer, more caution. If it clears the frame and the brake, ride slowly and stay off it out of the saddle. If it does not clear the frame, the ride is over — a wheel touching a chainstay is not something to negotiate with.
- Rim brakes rubbing after a wheel change — Nearly always the wheel not seated squarely in the dropouts, or the quick release left open. Loosen, seat the wheel fully, close the lever properly. Check this before adjusting anything.
- Disc brakes rubbing after a wheel change — Loosen the caliper bolts slightly, squeeze the lever hard and hold it, retighten. That centres the caliper on the rotor and fixes it most of the time.
- A disc brake lever that has gone to the bar — If the pads were pumped together while the wheel was out, insert something flat and clean to push the pistons back and refit the rotor. If it is a fluid or a heat problem, that is not a roadside repair — use the other brake and descend at a speed that respects having one.
- A dropped or contaminated disc pad — Oil on a pad ruins it and no amount of cleaning reliably brings it back. It will squeal and it will not stop you properly. Ride home on the other brake.
- A bent or cracked frame or fork, or a loose crank — Stop. These are the ones that fail suddenly and at the worst moment, and there is no roadside version of the repair. This is what the phone is for.
- A bodge is a bodge and should be ridden like one — A shortened chain, a locked-out gear, a backed-off brake or a wheel with a broken spoke all change what the bike will do. Ride within it: slower, no sprinting, no hard descending, and stay seated over anything rough.
- One brake is not two — Perfectly rideable home and not rideable normally. Front-only or rear-only both change stopping distance and behaviour substantially, and a wet descent is where that arrives.
- Fix it properly afterwards — The failure mode of a good roadside repair is that it keeps working well enough to forget about. A joining pin, a booted tyre and a shortened chain are all temporary, and the bike should not still be on them next month.
- Nothing here covers an e-bike’s electrical system — Motor, battery and wiring faults are the manufacturer’s and a dealer’s, not a roadside job, and a damaged lithium battery is a fire risk rather than an inconvenience. The mechanical half of an e-bike is a bike and everything above applies to it.
Questions this guide answers
Listed so you can tell at a glance whether this is the page you wanted. HobbyHQ keeps one guide per question family rather than a page per phrasing.
- puncture halfway round a ride what to do
- bicycle chain snapped on a ride
- bike gears not shifting mid ride
- brake rubbing after wheel removal
- broken spoke can I ride home
- what tools to carry in a saddlebag
- wont shift into the big ring
- tubeless tyre wont seal
Sources for this section
- The Highway Code — rules for cyclists (59 to 82) (opens in a new tab) — UK Government (Department for Transport) · Governing body · read — supports the claim
Part of Cycling. Last reviewed 2026-08-19.