Excerpt from Fixing a Flat Bike Tire
Rob Baur

4 The first step is to take the affected wheel off your bike and, if necessary, let out any remaining air. To remove the tire from the rim, insert a tire lever under the edge of the tire between the tire and the wheel’s rim. Then insert another lever a few inches away from the first, and push down on the end of each lever to lift the tire away from the rim. At this point, you can use your hands to pull the flat inner tube out from inside the tire.
Which would you use to remove a tire from a rim?

A) valve
B) bike pump
C) inner tube
D) tire lever