More on Plus Sizing

When creating a Plus Size fitment, the section width of the tire increases and the sidewall height decreases. The contact patch of the tire changes shape by becoming shorter and wider. While the shape changes, the size (area) of the contact patch remains relatively unchanged.
  • High aspect ratio = tall and narrow contact patch
  • Short aspect ratio = chort and wide contact patch
What does this mean?

The tread blocks with a taller, narrow profile have more deflection than tread blocks on a lower profile tire. Less deflection results in more cornering force and capability. This assumes all other things are equal, i.e same tread compound, design, etc.

In summary, installing a Plus Size Tire & Wheel Package changes the shape of your contact patch resulting in improved cornering, improved steering response, and a decrease in ride comfort due to the shorter sidewall.

Feel free to a contact a Tire Rack sales specialist for assistance with Plus Size options.


Tuesday, November 9, 2010 by Brian Rogers

My 2010 Nissan Frontier CC Pro4X has 265/75/16 tires. I'd like to go to a not so tall Michelin. Would 265/70/16 work OK. Any help you can give is appreciated. Thanks!
Wednesday, May 4, 2011 by Paul Petersen

Curious about tire plus sizing options for my 09 Chev Tahoe Hybrid. Currently has 265 65 18 installed.
Wednesday, May 4, 2011 by Hunter

It looks like we can put the Tahoe Hybrid into a plus Zero 18" or 20", 22" and even 24" if you want to change wheels as well. Not sure what you had you in mind. Please feel free to contact me directly at ext. 744 to discuss your situation.
Take good care,
Monday, June 24, 2013 by Mike

I have 205/50/16 tires on my car now. Can I change the aspect ratio to 60s? Need help. thanks
Tuesday, June 25, 2013 by Hunter

Hi Mike,
Changing the profile by points will most likely result in rubbing of the tire onthe car somewhere.
Monday, September 8, 2014 by Atif

I have a 2014 VW CC R-Line. For sake of increased ride comfort, i'd like to go up in aspect ratio to 235/45/18 instead of the OEM 235/40/18. Is this OK?


Wednesday, September 10, 2014 by hunter

Hi Atif,
We can't guarantee 235/45R18 to fit without rubbing or hitting something on the vehicle
Monday, November 17, 2014 by John

Have 225/55R18 on Mitsubishi Outlander GT. Want Continental Purecontacts. Can go either 235/55R18, 235/50R18, or 245/50R18. Which is best for minimum change.
Monday, January 5, 2015 by FRED

Would P235/50 R18 work on 2004 Murano. Currently have P235/65 R18.
Monday, January 5, 2015 by hunter

235/50 cannot be interchanged for 235/65. Sorry
Tuesday, April 7, 2015 by Norman

May I change my OEM 225/45r18 to 215/55r18? Thanks.
Tuesday, April 7, 2015 by hunter

Hi Norman,
I believe that is too large of an increase in size for most vehicles.
Friday, August 28, 2015 by Jim

I would like to change my saab 07 aero combi aspect ration from a 45, to a 55, is this reasonable. Consideration for handling, and wear on suspension parts.
Friday, August 28, 2015 by hunter

Hi Jim,
That would result about a 2 inch taller tire. It is unlikely you will be able to get that size on the car.

Leave a comment