- Remove the wheel with the torn tire casing.
- Use your fingers or tire levers to remove bead from the rim on one side of the tire.
- Leaving the tire on the rim, pull out and patch or replace the blown tube.
- Fill tube with just enough air for it to take shape.
- Replace valve through the valve hole of the rim and tuck the tube back into the tire.
- Take an energy bar wrapper, energy gel wrapper, dollar bill, or other tough material, fold it a few times for extra strength but make sure to leave it much larger than the tear in the mountain bike tire casing. Tuck your folded reinforcement in between the tire and tube so the tear is at the center and you can see your reinforcement through the tear.
- Replace the free tire bead back into its position along the rim using tire levers if necessary.
- Pump the tire up about half way and check for proper bead placement around the rim and make sure your reinforcement is still in place and holding.
- Finish pumping the tire up to a rideable pressure. If your tear in the mountain bike tire casing is small you may be able to pump it to your normal riding pressure. If the tear on your mountain bike tire casing is bigger you will have to limp home on lower pressure and make sure you don't pinch flat on the way. You will be able to tell how much pressure your reinforced tear can hold by how much your tire stretches and distorts around the tear.
Any pressure below about 25 psi. will lead to pinch flat trouble. So make sure your patchwork can hande at least that much before you start the ride home.
- Replace the wheel.
- Ride on.
- Watch Your Pressure - Don't let the reinforcement or tire bulge too much or it will blow out again.
- Be careful not to pinch your tube with your tire irons when removing or replacing the bead. Try not to use the tire levers if you don't have to.
- You should always carry an energy bar in case you need it, and since you should always carry your trash out, you will always have what you need for this fix.
What You Need
- Trail Pump
- Patch Kit and/or Spare Tube
- Tire Levers
- Energy Bar Wrapper, Energy Gel Wrapper, or Dollar Bill