Just got bit by the AX bug earlier this year and I'm trying to improve my times but want to keep my 2004 986 S as stock as possible. I just purchased a set of 17" turbo twists to replace my 18" wheels. The 18's have Michelin all seasons mounted on them and want to keep them on for non track days. So I decided to get track wheels and tires to install for the track.
Existing wheels and tires -
225/40-18 7.5x18 ET50 - Front
265/35-18 9x18 ET52 - Rear
New Wheels and Tires
225/45-17 7x17 ET55 Front
255/40-17 8.5x17 ET50 Rear
I used the following site to determine if the new wheels and tires would fit on my Boxster.
Online Wheel and Tyre Fitment Calculator. Offset, Tyre Stretch and Speedo Error | Will They Fit
The results showed they would fit but the chart also mentioned that the outside of the tire would not poke out as far as the existing. 11.4 mm on the fronts and 4.4 mm on the rears.
Would it be advantageous to add 10mm and 5mm spacers to the car? I'm not sure if the track would be wider at that point?
Thanks in advance.