tire size question

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Nov 22, 2011 | 06:45 PM

acrc6

Thread Starter

Instructor

Joined: Nov 2007

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tire size question

Im trying to find out if upgrading the front tires to 255/40/18 and upgrading the back tires to 305/30/19 will cause any issues with the AH/TC on C6 stock rims?

Looking to run the R888's out back and want to keep the fronts with the same amount of overall diameter as possible.

The 265/35/18 sacrifice diameter and I dont want to add any more wheel gap.

Anyone know if this will cause issues?

I searched the forum but couldnt really find too much.

Thanks in advance.

Nov 23, 2011 | 12:25 AM

jon6.0

Melting Slicks

Joined: Apr 2007

Posts: 2,987

Likes: 16

From: Phoenix

The 305 is a shorter tire than stock and a 255/40 is a taller tire than stock. I think you will be rolling the dice as most people seem to go with the 305/265 combo.

Nov 23, 2011 | 12:37 AM

oldmansan

Safety Car

Joined: Sep 2007

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From: Los Alamitos California

St. Jude Donor '09

Quote:

Originally Posted by jon6.0

The 305 is a shorter tire than stock and a 255/40 is a taller tire than stock. I think you will be rolling the dice as most people seem to go with the 305/265 combo.

I've found that in previous discussions that the active handling/traction control is far more forgiving than most think. I made sure to keep my relative tire diameters similar to stock, but I don't think it's nearly that sensitive.

San

Nov 23, 2011 | 09:20 AM

FloydSummerOf68

Race Director

Joined: Mar 2007

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From: Missouri City Texas

Quote:

Originally Posted by oldmansan

While I'd run a 265/305 combo and just lower the car a bit, you should be fine. Why not just keep 245/305 though? A taller front tire and shorter rear tire will look odd I'd think.

Nov 24, 2011 | 09:52 AM

acrc6

Thread Starter

Instructor

Joined: Nov 2007

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Quote:

Originally Posted by FloydSummerOf68

While I'd run a 265/305 combo and just lower the car a bit, you should be fine. Why not just keep 245/305 though? A taller front tire and shorter rear tire will look odd I'd think.

I wouldn't mind running the 245/305 combo; however, I'm concerned about throwing off the ratio too much that will affect the AH/TC.