was corrupt I installed it as an update for a John Deere LA115 mower. I've seen videos on YouTube that said they greatly improve handling. Installation went smoothly, although I had to file off some burrs on the mower's crossbar to get the locking rings to fit properly. In this case, make sure you have completely removed the sawdust before installing the bearings. To be honest I haven't noticed much of a difference from before installing these bearings (and yes I have lubricated them thoroughly and the grease comes out of the bearings easily). two washers that serve as raceways for the bearing). If you think bearings are better than machined and lubricated surfaces then by all means install them on your mower, but if you lubricate your mower at least every season you probably won't notice much difference, if any, after installation .