JSolo

iTrader: (14)

@Neal, what happens when a 245 tire is installed on a 7.5" wheel, which is then rotated to the rear of the car (which originally had a 8.5" wheel). The idea is to get a square setup with 245/45/18 all around instead of the staggered set up the car came with. How will handling/cornering be affected?

Neal@tirerack

iTrader: (2)

It's pretty common to do that. The wider front tire up front will help plant that end a bit more in the corners. A 245 will work fine on a 7.5" wheel.

MaluG37

Neal...would a 245-45-18 tire mounted on 18x7.5 wheels create too much side wall flex, as opposed to a the same size tire on 18X8? I have a g37x sedan with 17s and wanted to upgrade.

Does anyone have pictures of the two scenarios?

Neal@tirerack

iTrader: (2)

You won't feel, nor likely see, any difference between those two wheel widths. You'll notice more moving from a 17" to 18" than a half inch in wheel width,

TinsleyC

The 45 vs 50 sidewall height is not a "measurement", it is a percentage of the tire's width, called the Aspect Ratio. A 225 tire is 225 millimeters wide, called the Section Width. A 245 is 245mm wide. So a 225/50 means the sidewall height is 50% of the width, or 112.5mm. A 245/45 sidewall height is 45% of a 245mm width, or 110.25mm - just very slightly less than the 225/50.

It's all explained on TireRack's site - look for "Section Width".

Tire Tech Information - Tire Size Guide

I wish I had 18" wheels... I'd go with the 245/45-18 for sure.

platinumg35x

bumping this up because I have a similar question. I currently have 225/50/18's all around on the stock X sport wheels (18x17.5) all around. Will switching to 245/45/18 all around make the car appear jacked up (will the wheel gap appear bigger even tho it won't be)? Car is on stock suspension. Thanks.

blnewt

iTrader: (13)

No, you'll still have the same sidewall size, diameter is only off by .16".
Your sidewall is 45% of the width since your "new" tire is wider. Compared to your old tire being 50% of the width. Still roughly the same diameter though

bvshearz

I'm gonna be buying tires also like Kromber here,in a few days, after reading these post , I'd like to know if anyone can tell me, is there any noticeable ride difference between the 245/45/18 and the 235/50/18 series. Kromber what did you wind up buying? I'm leaning towards buying Pirelli Cinturato P7 + based on reviews at Tire Rack. Does anyone have/had these on their G37?