Schrader valves are the same ones used on car tires. Presta valves have a locknut on the end, and are longer and thinner than Schraders. Dunlop valves are thicker than Prestas but thinner than Schraders, and only have threads near the top. Some bike wheels use a lock ring to secure the valve stem to the bike rim. Unscrew and keep this lock ring if your wheel has one.
While you’re at it, inspect the tire for cuts or other damage. If you find a cut longer than 1⁄4 inch (0. 64 cm), replace the tire rather than trying to repair it.
Even if you can see a puncture right away, it’s smart to check for additional holes or tears.
If you’ve lost the kit’s little piece of sandpaper, you can use a rough surface like the pavement or even your zipper to scuff the tube.
This is not an ideal solution and should only be done if absolutely necessary. The tire may fail suddenly with this kind of repair, which could lead to serious injury.
Use caution when riding as your bike will not handle properly when you employ this kind of fix. Also, this type of fix may damage the rim.
Slide the wheel onto the frame’s fork, but avoid the chain or other obstructions. Reconnect the brakes, reversing the procedure you used to disconnect them — this will vary by brake type. Latch the quick release or tighten the nuts that hold the wheel in place. Hop on your bike and go for a spin!
