2torial #0707:
Learn2 Fix a Bike Flat (continued)

Remount the tube

Whether you're inserting a patched tube or a new one, the most important thing is to make sure it sits properly inside the tire.

To properly reinsert an inner tube, release most of the air, until it's limp but not flat. If you're replacing the old tube with a new one, pump just a little air into it to attain the same effect. If you have it, sprinkle a little talcum powder around the tube. This will help it seat properly inside the tire.

Insert the valve into the hole in the wheel rim, and tuck the rest of the tube under the tire. Check as you go to see that the tube doesn't stretch or twist. Make sure the valve sits straight through the hole (and not at an angle) when you're done.