How do you get a back tire on bike off if the bikes have gears?

* Shift the bike into the lowest gear.

* Loosen the quick-release skewer or axle nuts on both sides of the wheel.

* Lift the bike up so that the wheel is off the ground.

* Remove the wheel from the bike.

2. Deflate the tire. You can do this by using a tire lever to pry the tire off the rim, or by using a pump to remove the air from the tire.

3. Remove the inner tube. Once the tire is deflated, you can remove the inner tube by pulling it out of the tire.

4. Inspect the tire and inner tube for damage. If there are any holes or tears in the tire or inner tube, you will need to replace them.

5. Replace the inner tube. To do this, you will need to:

* Insert the new inner tube into the tire.

* Inflate the inner tube to the recommended pressure.

6. Replace the tire. To do this, you will need to:

* Position the tire on the rim.

* Inflate the tire to the recommended pressure.

7. Replace the wheel on the bike. To do this, you will need to:

* Insert the wheel into the bike frame.

* Tighten the quick-release skewer or axle nuts on both sides of the wheel.

8. Test the brakes to make sure they are working properly.