Ok everyone.

I have searched through threads, used tire calculators and tape measures. No matter what I do I cannot figure out the largest circumference of an 18 tire I can use on my CM.

None of the tire dealers seem to want to assist me, if it isn't in the computer as an alternate size, I am SOL. While I want a really aggressive AT type tire, I need something to fill up the gap between the wheel and fender more than anything. I am personally a fan of the old school big rubber look. I ran extremely low profile tires on my last MINI and got sick of replacing them everytime I ran over a pebble. Heck maybe even a whitewall would be nice (Completely kidding on this one).

Michael

 

The largest I've seen here is GeoffreyM's 225 50 R18's. He has some photos posted. If i recall correctly he was using Kumho 4X's. When it's time to buy winter tires I'm thinking I will go with this size.

 

i fit 205/70-16 winter tires on my cms all4

they are 27.3" od, 1.4" od larger than the oem 225/45-18 tires and nothing rubs, even with 6 180 pounders sitting in the car, 1 in each seat and 2 in the open boot, sitting on the ledge

scott

 

I have 235/50-18s (27.3" od) on rims with a 48mm offset and no rubbing, no binding.

I believe I read in a previous post about 225/55-18 fitting but may have had some rubbing.
https://www.northamericanmotoring.co...09-post64.html


Here is another thread with 235/50-18.
https://www.northamericanmotoring.co...0-55-18-a.html

Post what you decide to go with and how it works out for you.

 

updated info on my large OD tires to include the wheel specs

the wheels are oem mini alloys, 5x120, 16" x 6.5", offset 46mm

tires are 205/70R-16 Dunlop Grandtrek SJ winters, 27.3" OD

no interference or rubbing noted

scott

 

Michael, to use an AT type tire, you will have to drop down to a 16" rim
because the lowest profile AT tire is going to be a 70 series, and most will be 75 series or even taller

here is a photo of my cms all4 with sport suspension on 205/70-16 winter tires, the wheels are mini OEM 16" alloys, 16-6.5 with 46mm offset, the OD is 27.3"

these fit with no rubbing, even with 6 180 pounders aboard, 1 in each seat plus 2 more sitting in the open boot







photo with stock 225/45-18s, 25.9" OD