Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB - View Single Post - Anyone running square 215/40r18 on 18x7.5?

swarb · 07-07-2016, 04:07 AM

Read the specs on the stock tire, they are right around 24.7 diameter, on a 7inch width rim. .5 inch is about 13mm wider, 10mm wider tire sounds logical doesn't it? Read the spec's on the 215/40 you are looking at.
My advice would be to get 225/40-18 which is right around 25inches. 1-2% wont make a noticeable difference, and that extra meat is good for grip and comfort(sidewall height). And it would also give you a little more rim protection from the tire. 225/40. DO IT. Trust. 215/40's look like rubber bands.

07-07-2016, 04:07 AM	#2
swarb Senior Member Join Date: Sep 2014 Drives: BRZ Location: Los Angeles Posts: 3,052 Thanks: 1,773 Thanked 2,451 Times in 1,271 Posts Mentioned: 79 Post(s) Tagged: 0 Thread(s)	Read the specs on the stock tire, they are right around 24.7 diameter, on a 7inch width rim. .5 inch is about 13mm wider, 10mm wider tire sounds logical doesn't it? Read the spec's on the 215/40 you are looking at. My advice would be to get 225/40-18 which is right around 25inches. 1-2% wont make a noticeable difference, and that extra meat is good for grip and comfort(sidewall height). And it would also give you a little more rim protection from the tire. 225/40. DO IT. Trust. 215/40's look like rubber bands.