Review on Marathon Purpose Utility Centered Bearings Tools & Equipment by Marco Mooney

I use these for the rollers on my zero turn mower. So you made a good point. I can't get non-flat tires from Toro and they are half the price they charge for inflatable tires that are flat for three months. One tire had an end plate coming out of the hub so I lost the bearings on that side. And another tire lost its grease fitting which I believe could not be installed properly due to bad threads in the hole. So I would say they have some manufacturing issues but for the price I still use them until they fall apart.