Ric- Thank You Sir. It's odd tho, we can stand way back behind his Z & look & the rear tires, & they do look to have a very slight inward slope at the tops of both tires, like a negative camber look.
That & he runs 24 psi. Which rides very hard. I would think running that high of psi would wear out the centers of the tread first. Unless the Zero's are set up with a very mild neg camber to aid in fast turns & not cuting up lawns as easily, & maybe a little better grip on slopes, IDK ?
Our 1996 BMX Z-3 had heavy negative camber set up on rear tires, to take turns like crazy & it stuck like glue. & the Z rated tires wore evenly.