Tire Diameter Impact Front Rear
#1
Track Day
Thread Starter
Tire Diameter Impact Front Rear
I need to buy a new set of tires because Falken doesn't make my rears anymore. Have a 2004 996 C4S. So I'm looking new tires on Tire Rack and start comparing tires. I was looking at the Sumitomo's and noticed that front diameter/rev's per mile are different for fronts and back (25.1/826 v 24.9/834). So I'm thinking maybe because they're cheap. I then look at the Bridgestone Potenza's and they're worse at 25.3/823 fronts and 24.9/837 rears! And they are Porsche N3 approved. With the car being AWD, am I asking for trouble down the line? Thanks
#2
Race Director
I need to buy a new set of tires because Falken doesn't make my rears anymore. Have a 2004 996 C4S. So I'm looking new tires on Tire Rack and start comparing tires. I was looking at the Sumitomo's and noticed that front diameter/rev's per mile are different for fronts and back (25.1/826 v 24.9/834). So I'm thinking maybe because they're cheap. I then look at the Bridgestone Potenza's and they're worse at 25.3/823 fronts and 24.9/837 rears! And they are Porsche N3 approved. With the car being AWD, am I asking for trouble down the line? Thanks
The "trick" is to stay within the wheel/tire sizes and the resulting different revolutions per mile numbers sanctioned by Porsche.
#4
I dont think there will be any difference in any tire mfg for a specific size tire. if one mfg makes a 295/30 /18 the next mfg will be in the same spec
you go by the size that porsche recommends , do you think the front and rear are equal?
you go by the size that porsche recommends , do you think the front and rear are equal?
#6
Race Director
#7
Race Director
If they do fine. If they do not I would be leery of using the non-sanctioned set of wheels/tires. That front diff and its viscous coupling is an expensive piece of hardware.
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