I was definitely looking to start a thread like this.. It's 100% sure that
235/35/19 tires on 19x8.5 +45 will fit with a 5mm spacer in front and a 10mm in back. (SEMA car specs)
I am probably going 235/40/18 on 18x8.5 +30-40
You can assume most 2012 Civic Si set-ups will be like ours as far as size/fitment.. if you're looking to go slammed/fitted it's easier to keep the wheel 8" width or less.
235/35/19 tires on 19x8.5 +45 will fit with a 5mm spacer in front and a 10mm in back. (SEMA car specs)
I am probably going 235/40/18 on 18x8.5 +30-40
You can assume most 2012 Civic Si set-ups will be like ours as far as size/fitment.. if you're looking to go slammed/fitted it's easier to keep the wheel 8" width or less.