Thats my question would a 255/55/18 fit on a 18" w/ a eibach or bwoody drop and still be fine or would i have to go to a 255/50/18...and what kind of tire should i go with ? - I dont care much about noise so if a crazy offroad tire will work better than a studless winter i'm all fine with that.

255/50 18 = Overall Diameter: 28.03 in 711.96 mm 2.2% less than stock.

275/40 20 = Overall Diameter: 28.66 in 727.96 mm

255/55 18 = Overall Diameter: 29.04 in 737.61 mm 1.31% more than stock

^ thanks, the 10mil difference should be just fine