A flat tyre is the most common reason a ride ends early — and the easiest mechanical to fix yourself once you've done it once. This guide walks you through repairing a puncture step by step, for both tubed and tubeless tyres, plus how to stop getting flats in the first place. Carry the right kit and you'll be rolling again in under ten minutes.
What you need to fix a flat
- Spare inner tube (the fastest roadside fix) and/or a patch kit
- Two tyre levers
- Mini pump or CO₂ inflator
- For tubeless: a plug kit and sealant
- Optional: a multitool and a small rag
On the road, swapping in a spare tube is much faster than patching — patch the punctured tube later at home.
Tubed vs tubeless: which do you have?
If your tyre runs an inner tube, you fix a flat by replacing or patching that tube. If it's set up tubeless, there's no tube — small punctures are usually sealed automatically by the liquid sealant inside, and larger ones are fixed with a plug. The steps below cover the classic tubed repair first, then tubeless.
How to fix a flat (tubed tyre), step by step
- Get to a safe spot. Move off the road to flat, stable ground.
- Remove the wheel. Shift to the smallest cog, open the quick-release or loosen the axle, and lift the wheel out.
- Inspect the tyre. Run your fingers over the tread (carefully) and look for the glass, thorn, or wire that caused it. Remove it — if you miss it, your new tube flats instantly.
- Lever the tyre off. Hook one tyre lever under the bead and clip it to a spoke, then use the second a few inches along to free one side of the tyre. Pull out the tube.
- Find the hole (if patching). Inflate the tube slightly and listen or feel for escaping air; submerge it in water to spot bubbles if needed. Mark the spot.
- Repair or replace. For a patch: roughen the area, apply glue and patch per the kit. For speed: fit a fresh tube instead.
- Refit the tube and tyre. Inflate the tube just enough to hold shape, seat the valve, tuck the tube in, and work the bead back onto the rim by hand. Check the tube isn't pinched under the bead.
- Inflate to the right pressure. Pump to the PSI on the sidewall, checking the bead sits evenly with no bulges.
- Reinstall the wheel. Seat it in the frame or fork, engage the chain, and tighten the quick-release or axle securely.
- Test it. Spin the wheel, do a short test ride, and recheck pressure after a few minutes for slow leaks.
How to fix a tubeless puncture
Most small tubeless punctures seal themselves in seconds — you'll see a little sealant spray, then it stops. If it doesn't seal, push a plug into the hole with a plug tool, trim the excess, and re-inflate. Keep your tubeless tyre sealant topped up, because it dries out over a few months in India's heat and an empty tyre can't self-seal. For a hole too big to plug, fit an inner tube to get home.
How to avoid flats in the first place
- Run the correct pressure. Under-inflation is the #1 cause of pinch flats — see our bike tyre pressure guide for the right PSI.
- Inspect tyres regularly and pick out embedded grit and glass before it works through.
- Replace worn tyres. A squared-off or cracked tyre flats far more often.
- Consider tubeless if you ride trails — it shrugs off most thorn and glass punctures.
What to carry, and where
The only thing worse than a flat is a flat with no kit. Keep a spare tube, levers, a mini pump or CO₂ inflator, and a patch or plug kit on the bike at all times. A saddle bag is the classic home for repair essentials; for bigger loads or bikepacking, a frame bag or a compact storage strap keeps everything secure and rattle-free on every ride.
Frequently asked questions
How long does it take to fix a flat bike tyre?
With practice, swapping in a spare tube takes about 5–10 minutes. Patching a tube takes a little longer because the glue needs a minute to set.
Should I patch or replace the tube?
On the road, replace it with a spare — it's faster and more reliable. Patch the punctured tube later at home so you always have a backup.
Why does my new tube keep going flat?
Usually the cause is still in the tyre. Re-inspect the inside of the tyre for a thorn, glass shard, or wire, and check the rim tape covers the spoke holes. A pinched tube during fitting can also cause an instant flat.
Can I fix a tubeless tyre without removing the wheel?
Yes. Most tubeless punctures seal themselves, and a plug can be inserted with the wheel still on the bike. You only need a tube (and to remove the tyre) if the hole is too large to plug.
What pressure should I inflate to after a repair?
Inflate to the range printed on the tyre sidewall, adjusted for your weight and the surface. See our tyre pressure guide for the correct PSI by bike type.
The bottom line
Fixing a flat is a five-minute job once you've practised it at home. Carry a spare tube, levers, and a pump, run the correct pressure to avoid pinch flats, and keep tubeless sealant fresh — and a puncture becomes a minor pause, not a ruined ride.