Will these fit?

[tk-4]

thanks for the input...now i've got a question bout tire sizes. from all the online tire sites and such, i believe that the recommended tire sizes for a boxster (non-s) with 18" rims are 225/40/18 and 265/35/18. my current stock 17" set up is 205/50/17 and 255/40/17.

now in the past, i've been told that it's important to keep the diameter/circumference the same when you're up/down sizing your wheels. based on a wheel calculator website, i got these results and was wondering if 255/35/18 would be an actual better fit for the rears.

Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
205/50-17 4.0in 12.5in 25.1in 78.8in 804 0.0%
225/40-18 3.5in 12.5in 25.1in 78.8in 804 0.1%

Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
255/40-17 4.0in 12.5in 25.0in 78.6in 806 0.0%
265/35-18 3.7in 12.7in 25.3in 79.5in 797 1.1%

Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
255/40-17 4.0in 12.5in 25.0in 78.6in 806 0.0%
255/35-18 3.5in 12.5in 25.0in 78.6in 806 -0.0%

would they be recommending a wider tire (265) because of a wider rim width?

agains, thanks for the help.