265/35-18
Instructor
Joined: Oct 2011
Posts: 130
Likes: 12
From: Buford GA
I have a set of track wheels with Bridgestone 275/35/18 fronts and there is no issue. There is a little less sidewall than the 40 series profile of the stock size, so yes, there is less height to absorb pot holes on the street. If your local roads have you blasting through craters all the time, it might be something to think about, but it's not a problem for average roads. The 35 series non-RFT actually rides smoother on rough roads than my 40 series RFT's.
As Dev said, you have to lower the rear profile or you will have TC (ie: AH) issues at speed. With those fronts, I run the 305/30/19 rear. No Active Handling issues with that combo and I have tested it up to 140 mph.
As Dev said, you have to lower the rear profile or you will have TC (ie: AH) issues at speed. With those fronts, I run the 305/30/19 rear. No Active Handling issues with that combo and I have tested it up to 140 mph.
Burning Brakes
Joined: Jul 2013
Posts: 823
Likes: 7
From: Rosewood Heights IL
I have a set of track wheels with Bridgestone 275/35/18 fronts and there is no issue. There is a little less sidewall than the 40 series profile of the stock size, so yes, there is less height to absorb pot holes on the street. If your local roads have you blasting through craters all the time, it might be something to think about, but it's not a problem for average roads. The 35 series non-RFT actually rides smoother on rough roads than my 40 series RFT's.
As Dev said, you have to lower the rear profile or you will have TC (ie: AH) issues at speed. With those fronts, I run the 305/30/19 rear. No Active Handling issues with that combo and I have tested it up to 140 mph.
As Dev said, you have to lower the rear profile or you will have TC (ie: AH) issues at speed. With those fronts, I run the 305/30/19 rear. No Active Handling issues with that combo and I have tested it up to 140 mph.
No issues with the TC? Also, what brand? Different brands can have narrow tread width and/or different diameter for a given aspect ratio.
Instructor
Joined: Oct 2011
Posts: 130
Likes: 12
From: Buford GA
I'm running Bridgestone RE-11's on OEM coupe wheels. I picked the 275/35 - 305/30 sizes because the stagger calculates out to be within the factory tire sizing F/R diameter ratio limits. If I remember correctly, the 265/35 - 305/30 combination also works, but I like the wider rubber on my track tires.
There are no TC issues with this sizing combo. They will even tolerate a little bit of rear wheel churn at high speed. I've done it at around 100 mph on several occasions and the car allows only just slightly less churn than the stock tire size can get away with. (Not a bad thing at that speed!)
Here's pics of the tires mounted up:
275/35/18 Front
305/30/19 Rear
Intermediate
Joined: Feb 2008
Posts: 35
Likes: 0
From: Lakeland Florida
My 07 base c6 has had the original tires, 305/30, 325/30, and 345/30 on the back factory rims. They all fit good. All of those did not mess with the traction control. My fronts need to be replaced and I'm going to 275/35/18's in front to go with my 325/30/19's now. Doesn't Z06's have the 275/35/18's and 325/30/19's as factory size? I think they are almost the same diameter as the factory base model tires and there should be no problems with the upgrade.
Race Director
Joined: Oct 2007
Posts: 11,367
Likes: 211
From: Edgewood Washington
St. Jude Donor '11-'12-'13-'14-'15
If you did manage to mount them, I'm guessing they are not runflats.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Safety Car
Joined: Nov 2007
Posts: 4,436
Likes: 875
From: Bay Area CA
Yeah, the shoulder roll up with a 10" rim and a 345 tire would look ridiculous. A 10" rim allows a 295 max tire, anything more the tire shoulder rolls up and can cause high speed instability.