ForTehNguyen

I have always wanted these white 18" motegi MR7s with 215/40/18 yoko paradas on it. I did some calculating on the tire diameter + sidewall height and the 18s with the lower profile (of course) were larger in total diameter than stock 16s with 205/50/16 tires, about 2 inches. So divide that by two and there is an extra inch going into the wheel gap from the top of the tire. So if I did get these would this extra inch fill in the wheel gap in the fender? I will never drop my car because I am not fond of stiff suspensions and I dont want to worry about scratching my front lip all the time, but I dont want to look like an SUV. I did these calculations assuming the 215 in the tire size is millimeters correct? And the 40 in the tire size means 40% of the width 215 correct? Any comments? Thank you

eM^x

you calculated wrong. you'd only be increasing overall diameter by 0.7 inches. here's a helpful site that does the calculation for you http://www.miata.net/garage/tirecalc.html

171STS

I think tirerack.com will give you overall circumference measurements as well, so you can compare tires and ratios.

171STS

you know if will affect ur speedo .... right
if you do not plus size

ForTehNguyen

yea i had a feeling i calculated wrong. Oh well. How would it look? I mean stock height seems just a little high for me, but if the 18s fit it in, I will be more interested. Maybe if i get 45 aspect ratio for a tad smoother ride?

ForTehNguyen

Instead of 215/40/18 how would 215/45/18 look? I would like a smoother ride