Traction control & Tyre Diameters
Thread Starter
Member
Joined: Jun 2018
Posts: 88
Likes: 9
W205 C63s
Traction control & Tyre Diameters
Recently fitted new wheels and tyres to my C63s sedan. I am running 295/30/19 in the rear and 265/35/19 in the front.
Have a question:
Originally the diameter for front tyres was 25.8" now it is 26.3 .
Diameter for the rear tyres was 26.3" and now it is 26".
So Originally the rear tyres where 0.5" larger in diameter than the front.
Now the rear tyres are 0.3" smaller in diameter than the front.
This creates a total diameter difference of 0.8” from initial factory settings. I am wondering if this effects traction control? Is traction control calculated by wheel rotation of front wheels vs rear wheels via the ABS?
my feeling is that traction control kicks in earlier now because the rear wheels are smaller in diameter maybe the computer thinks that they are braking traction as they are spinning quicker than the front.
Also the rake of the vehicle has been slightly changed.
Have a question:
Originally the diameter for front tyres was 25.8" now it is 26.3 .
Diameter for the rear tyres was 26.3" and now it is 26".
So Originally the rear tyres where 0.5" larger in diameter than the front.
Now the rear tyres are 0.3" smaller in diameter than the front.
This creates a total diameter difference of 0.8” from initial factory settings. I am wondering if this effects traction control? Is traction control calculated by wheel rotation of front wheels vs rear wheels via the ABS?
my feeling is that traction control kicks in earlier now because the rear wheels are smaller in diameter maybe the computer thinks that they are braking traction as they are spinning quicker than the front.
Also the rake of the vehicle has been slightly changed.
Senior Member
Joined: May 2013
Posts: 317
Likes: 31
C8, FF, C63S, 911 C4S, GTI, E350, Boxster S, 355, Esprit S4, Vantage, S5, Z4, M3, Miata, A4, 325is
Recently fitted new wheels and tyres to my C63s sedan. I am running 295/30/19 in the rear and 265/35/19 in the front.
Have a question:
Originally the diameter for front tyres was 25.8" now it is 26.3 .
Diameter for the rear tyres was 26.3" and now it is 26".
So Originally the rear tyres where 0.5" larger in diameter than the front.
Now the rear tyres are 0.3" smaller in diameter than the front.
This creates a total diameter difference of 0.8” from initial factory settings. I am wondering if this effects traction control? Is traction control calculated by wheel rotation of front wheels vs rear wheels via the ABS?
my feeling is that traction control kicks in earlier now because the rear wheels are smaller in diameter maybe the computer thinks that they are braking traction as they are spinning quicker than the front.
Also the rake of the vehicle has been slightly changed.
Have a question:
Originally the diameter for front tyres was 25.8" now it is 26.3 .
Diameter for the rear tyres was 26.3" and now it is 26".
So Originally the rear tyres where 0.5" larger in diameter than the front.
Now the rear tyres are 0.3" smaller in diameter than the front.
This creates a total diameter difference of 0.8” from initial factory settings. I am wondering if this effects traction control? Is traction control calculated by wheel rotation of front wheels vs rear wheels via the ABS?
my feeling is that traction control kicks in earlier now because the rear wheels are smaller in diameter maybe the computer thinks that they are braking traction as they are spinning quicker than the front.
Also the rake of the vehicle has been slightly changed.
Also, I assume these are on the stock 19x8.5 and 19x9.5 rims?
