this is the first and last time it's gonna be said

Tire size doesn't make a f*cking difference

put the tires on with the right ride like the old one.
use: http://www.miata.net/garage/tirecalc.html

so if your stocks are: 195/55 on 15 inch, and you want 17 inch rimms, you need to put on 205/40

Sure you could take 225/35 or even 40, but you want to stick to the closest match of your old setup, otherwise your speedo is gonna be way off.


The rubbing is caused by a wrong Rimm offset.
use: http://www.rsracing.com/tech-wheel.html

Higher offset = Rim's stick out more

correct me if I'm wrong, but learn it ppl

 

eyeroll.gif
offset, tire size, width... they all make a difference. If you had 18x7.5 wheels with a 50 offset, they would rub. 45 would probably rub if you hit a bump/dip while turning. It's not a defective tib. Several people have used 18x7 with a 35 series tire.

And Viper... same to you. Tire size, offset, wheel width, it all matters. It does affect the speedometer, but not enough to worry about (1-3 MPH at most with our cars). I'm very familiar with that tire calculator as well, it's been around for 4 years or longer.

17x7 is optimal for our cars. 205/40 is good, but 215/45 is what I prefer because I have 17x7.5 and would like more protection for the wheels and a smoother ride, and it works.

 

i have 205/40/17 for the front, no rubbing at all, will change to 215/45/17 next round.