I bought these solid tire wheels for my girlfriend's Scag Liberty Z mower in July 2020 because her Scag inflatable front tires were always going downhill. Didn't bother to replace their inflatable scag tires with these new solid tires until the end of May 2021. The product was easy to assemble, however the solid tire wheels lacked the original axle guide tubes (internal bearing spacer). wheel skag The mower ran normally for about 5 hours before bearing failure caused damage to one of the solid tire wheels (it collapsed inwards). The product's solid tires performed well, but the wheel bearings are much less durable than I expected. I plan to take these bad wheels to a local mechanic and have the old wheel bearings pressed out. I will update this review when the wheels are fitted with new bearings including internal bearing spacers and the solid tire wheels are re-attached to the scag mower. Update 6/16/21: I went to the Marathon Industries website and filed a complaint about a bearing issue. Within a day I was immediately contacted by "Jill" from the sales team who was professional, thoughtful and helpful. Jill offered to send me 4 new wheel bearings. I am currently awaiting new bearings and will update this review when they arrive and are installed. However, I feel like Jill and Marathon supported their product and I'm happy with the outcome. Update 7/17/21: As promised, Jill from Marathon sent out four new wheel bearings and they arrived yesterday (delivery was delayed due to postage). eliminate misunderstandings). I haven't installed the bearings yet, but plan to do so soon. I will update this review in the future to include the specs of the new bearing and bearing spacer. Thank you Jill and Marathon Industries for professional, timely and helpful customer service!