I assume you all know how to repair a punctured tube (find hole, roughen surface, apply glue, let dry, apply patch, etc.), that said a couple of recent non-MFCC incidents promt me to add a few quick tips:
Getting the tyre off:
- Before you start make sure the tyre is free from the rim, on both sides. (just push the tyre away from the rim with your thumbs).
- Lever two or three tyre levers under the bead of the tyre, about 2-3 inches apart. Then lever all 2 / 3 over together – it sounds harder but works better than doing them one by one.
After applying the patch sprinkle chalk dust over the remaining, unused glue on the tube. This’ll prevent the tube from sticking to the tyre.
Check the tyre for foreign objects:
- If a thorn caused your puncture and it is still embedded in the tyre then it will cause another puncture as soon as you inflate the fixed tube.
- The easy check is to run your fingers round the inside of the tyre and feel for anything that shouldn’t be there.
- Pedantic check is to look carefully at the point where the puncture was found in the tube (assuming you haven’t moved the tyre on the rim).
Putting the repaired/replacement inner tube back in:
- Put one side of the tyre on the rim completely, leave the other side completely off (so tyre hangs off one side of the wheel).
- Put a little bit of air in the tube, just enough to give it shape – this will help avoid trapping it when you put the tyre back (if you trap the tube between the tyre and rim then you’ll almost certainly get a new puncture)
- When putting the tube in, start with the valve – it’s the only bit that has to go in a specific place
- Once you’ve got the tyre back on, push the valve in a little (push away from the hub), then push the tyre to the rim (near the valve) and then pull the valve back through – this makes sure the tyre is seated properly near the valve.