TESLA MODEL S P85+ with the P85+ rims: Front 8.5J x 21 Rear 9.0J x 21 Offset 40mm We all know that the best tire out there is the Michelin SuperSport. Problem is they do not make the rear tire for the P85+ yet. The rear tire is a 265/35R21. While the PS2 is a great tire it is terrible in the rain and doesn't use some of the newer materials for longevity. It also costs unjustifiably (in the year 2014) more than the SuperSport. Until the SuperSport is available I'm going to try and find something else. Do you think I can get away with 275 35R21 on the rear of a P85+? If so, I may try the Dunlop SP Sport Maxx GT. Dunlop makes a SP Sport Maxx GT with 10/32nd tread depth and almost identical revs per mile, slightly taller 275 x 35% = 3.5mm which is about 1/8" taller of a tire. Load range is XL, fits on a 9-11" rim, section width is almost less than half an inch wider. Revs per mile difference is only 3!! Perfect as to not mess with speedometer. Unknown: weight difference and rolling resistance comparison. EDIT: Weight: PS2 = 25.4LBS, Dunlop 275 according to TireRack: 31LBS... Not sure how credible the weight is but assuming this tire is slightly wider I could see it weighing an extra few pounds. No data on rolling resistance, has anyone researched that? See chart.