Common problem with old high-mileage lawnmowers. The rear wheel bearings were badly worn and the mower was not moving properly. New wheels are about $20 each and usually have the cheapest bearings, so I decided to swap out the bearings. The rubber tires were worn out, but that didn't help with the push mower. On a self-propelled lawnmower, it may make sense to swap out the drive wheels if you have little to no stepping surface. I would still replace the bearings with these. I used a brass drift to knock out the old bearings. To get the first one out you need to use a relatively narrow punch/punch as you have to go through the opposite bearing axle hole to knock the bearing out. Very little power is required. After both of the old bearings were removed, I used a 1" socket to install the new bearing. Since most lawn mower wheels are plastic, no press is required to install new bearings. Place the wheels back on the mower and you're done.Note: If the bearing bore is badly worn, you may need to glue the bearing on for permanent attachment, which is cheaper than buying a new wheel.