Will, My wheels are BBS RK 2 piece wheels purchased from the tirerack a few years back. I'm not sure of the offset I'll have to check the paperwork at home. I could have ran a stock sized tire at the back, but since the rims are 1/2" wider I got 285's mainly for aesthetics, (I don't like the look when the tread is not as wide as the rim).I'm concerned that the rears will rub. Given the stock rear wheel offset is 22mm as opposed to 20mm. I don't think I'll have a problem running 275 in the rear ( only 2mm difference) , but I want to make sure.