Original Steel Wheels on the S1 and and S2 are 4 1/2 inches wide, while the Lotus Brand Alloys are 5 1/2 inches.The acceptable width range for a 185/60R13 is a rim 5-6.5 inches wide and a 205/60R13 is a rim 5.5-7 1/ inches wide. Those Lotus Brand rims do well with those sizes. The smaller 60 series reduces the ride height by 3/4 of an inch which should slightly increase handling. I also have experimented with tire pressures and 16 psi on the front 26 psi on the back seems to offer the best handling characteristics. Those 205's seem to like -1 to Zero degrees camber.