Re: Tire sizing (Eyekahn)
I like using this for tire size calculations
http://www.miata.net/garage/tirecalc.html
FYI I run
205/50/17 winter
235/45/17 summer
235/40/17 track (beacause RA-1 came in this size)
245/45/17 track (used to run these in a Falken 615, again because limited sizes they came in)
255/40/17 maybe my next track tire, but worried abotu rubbing.
I run PSS-9s for suspension, but have them set at OEM ride height. I also have wheels studs, so it very easy for me to add a 5mm spacer or bigger if need be.