A flat or damaged lawn mower tire puts the brakes on yard and garden projects. For cut tires, or tires damaged beyond a simple plug repair, replacing the tire is the only option. A garage or shop will usually charge $10 to $30 to remove a tire from the existing rim. Performing this task at home will save time and money.
Check to make sure all the air is out of the tire before removing from the rim. Press the top of the screwdriver into the valve stem until all air releases through the valve. Trapped air in the tire may cause a problem if not released before breaking the tire's seal.
Lay the tire flat on a hard surface. Place the wooden block onto the sidewall of the tire next to the rim. Lightly tap the block with a shop hammer to break the tire's seal from the rim. Once tire releases from the rim, continue around the edge of the rim in the same manner to completely release the tire.
Flip the tire over and break the tire seal in the same manner. With the tire now loose on the rim, position a screwdriver between the tire and rim and pry the tire up over the rim's edge. Hold the tire in this position and place the second screwdriver next to the first and pry more of the tire above the rim. Continue around the rim with the two screwdrivers and pry the tire completely off on one side.
Flip the tire and wheel over to free the rest of the tire from the rim. Pull the now loose rim up as if pulling it free from the tire. Use the two screwdrivers to pry the rim out of the tire in the same manner as removal of the first half. Once the rim is free from the tire, set the rim aside and prepare to replace or repair the lawn mower tire.