I would think that you would not want to use good tires for the OTTs as they will ware the tire lugs quickly. My buddy has two sets of tires/rims. One new one Boloney skins for the OTTs.hey rookie, good question......I have the same question and the same predicament......looking at the design the way the OTT fits over the 2 tires it doesn't look like it matters how much tread is on them........unless the inside of the tack has to grip on good tread, but the way it boxes over on the sides, I don't think so......hoping somebody answers your question that has actual experience......at 1500.00 for the OTT setup lets hope they say you can put them over worn tires