mod..go to royal dist.Look up the polaris wheels(5.35") and you can also pu 7.5 rear wheels from the older SRX's.If you need part #'s,I can find them.That's what I have on both of my skids for years now.Hyfax doesn't wear it seems at all.Also marginal snow wheels up front help with the hyfax wearing down,but usuually wears so much and then it stops.I am happy with them.For the 7.5 rear wheels you'll have to cut your axle spacers down a tad because of the thickness of the wheels with the bearings installed is a tad thicker. There is a write up in here somewhere from years back.Maybe Betheviper wrote it,don't remember.