All lawnmower wheels will eventually wear down from heavy use. The hard rubber tires will typically last for many seasons. In some cases, long grass may build up behind a wheel, causing the wheel to stick. When this occurs you can pull the wheel from the mower body and clear the obstruction. Removing a lawnmower wheel requires a few tools and a wooden block.
Remove the sparkplug wire from the sparkplug on the engine. The sparkplug wire is a heavy rubber cord that fits over the top of the sparkplug. In most applications, the sparkplug is located on the side of the engine near the push handles. Consult the manufacturer's owner's manual for other locations of the engine sparkplug.
Block up the end of the lawnmower using the 4-inch by 4-inch by 10-inch long wooden block. Place the block under the metal mowing deck near the wheel. This will raise that end of the mower so the wheel has a free access to be removed.
Use the correct size socket that will fit on the wheel bolt. Place the socket on the ratchet. You can also use a crescent wrench if a socket ratchet assembly is not available. Use the thumbscrew on the crescent wrench to fit the jaws over the bolt head of the wheel.
Turn the wrench in a counter-clockwise direction to loosen the bolt. You may have to brace the mower with your foot so it does not move while you are loosening the large bolt.
Use you fingers to finish removing the bolt and wheel from the mowing deck. Observe if there are any washers on the rear of long wheel bolt. In many cases, the washers aid in standing off the wheel from the side of the mowing deck.