Do tire sizes effect Traction Control operation?
Thread Starter
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Joined: Jan 2014
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From: Sierra Nevada Foothills CA
Do tire sizes effect Traction Control operation?
I am planning on running 275/35/18 front. According to Tire Rack the tire diameter is identical to the stock 18 tires. (25.7)
At the rears I would like to run the 305/30/19. According to Tire Rack the tire diameter would be 0.5" smaller than the stock tire. (26.2 vs. 26.7")
Would that ratio difference between the front and rear effect anything, such as the traction control operation? If so, I may select the 265/35/18 size (25.3")
Also, is there anyone out there with a comparison between the stock Michelin SS and the Bridgestone RE-71? Car does not see any track usage but, nearly all of its use is very spirited canyon driving.
At the rears I would like to run the 305/30/19. According to Tire Rack the tire diameter would be 0.5" smaller than the stock tire. (26.2 vs. 26.7")
Would that ratio difference between the front and rear effect anything, such as the traction control operation? If so, I may select the 265/35/18 size (25.3")
Also, is there anyone out there with a comparison between the stock Michelin SS and the Bridgestone RE-71? Car does not see any track usage but, nearly all of its use is very spirited canyon driving.
Last edited by axr6; Oct 28, 2016 at 09:41 PM.
Tech Contributor
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From: Charlotte, NC (formerly Endicott, NY)
It isn't the half inch it is the ratio of the rear tire diameter divided by the front tire diameter you need to be concerned about.
The ratio has to be kept at ~ 1.04 to keep TC and Engine Drag Control happy. You might get lucky and be able to be at 1.02 through 1.06 but there isn't any way to know for sure without trying.
Bill
The ratio has to be kept at ~ 1.04 to keep TC and Engine Drag Control happy. You might get lucky and be able to be at 1.02 through 1.06 but there isn't any way to know for sure without trying.
Bill
Thread Starter
Pro
Joined: Jan 2014
Posts: 585
Likes: 65
From: Sierra Nevada Foothills CA
It isn't the half inch it is the ratio of the rear tire diameter divided by the front tire diameter you need to be concerned about.
The ratio has to be kept at ~ 1.04 to keep TC and Engine Drag Control happy. You might get lucky and be able to be at 1.02 through 1.06 but there isn't any way to know for sure without trying.
Bill
The ratio has to be kept at ~ 1.04 to keep TC and Engine Drag Control happy. You might get lucky and be able to be at 1.02 through 1.06 but there isn't any way to know for sure without trying.
Bill
Sr.Random input generator
Joined: Jan 2008
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From: Sammamish, WA
I did run 275/35/18 front, 305/30/19 rear setup at the track; no problems whatsoever. I do not have PTM, though, so cannot speak about it.
I also tried 315/30/18 front 325/30/19 rear last week at Oregon Raceway Park with great results. C7 seems to be much less sensitive to this sort of changes compared to C6.
I also tried 315/30/18 front 325/30/19 rear last week at Oregon Raceway Park with great results. C7 seems to be much less sensitive to this sort of changes compared to C6.
