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Old 03-30-2015, 04:50 PM   #1
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swapping out PP tires?

Got a buddy who also bought a 15 GT w/PP. He's wanting to swap out my fronts for his rears (9 vs. 9.5).. my question is how much of a difference would that 9.5 make in the front vs the 9? would it affect the driveability in a negative way?
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Old 03-30-2015, 09:26 PM   #2
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Quote:
Originally Posted by 13BKV6 View Post
Got a buddy who also bought a 15 GT w/PP. He's wanting to swap out my fronts for his rears (9 vs. 9.5).. my question is how much of a difference would that 9.5 make in the front vs the 9? would it affect the driveability in a negative way?
I'm sure you must be aware that the tires are of different width and diameters as well.
Fronts: 255/40/R19 x 9"
Rears: 275/40/R19 x 9.5"
In addition to the 20 mm difference in the width, there's an approx. difference of 5/8" in diameter.
I personally would not go wider than 255 on the front.
Would also compare offsets and setback, just for the hell of it.
Hopefully some more knowledgeable people will chime in on this.
Oh! I assume your buddy wants to do the swap to allow him more flexibility in rotating the tires.
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Old 03-31-2015, 09:34 AM   #3
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Originally Posted by Diehard View Post
I'm sure you must be aware that the tires are of different width and diameters as well.
Fronts: 255/40/R19 x 9"
Rears: 275/40/R19 x 9.5"
In addition to the 20 mm difference in the width, there's an approx. difference of 5/8" in diameter.
I personally would go wider than 255 on the front.
Would also compare offsets and setback, just for the hell of it.
Hopefully some more knowledgeable people will chime in on this.
Oh! I assume your buddy wants to do the swap to allow him more flexibility in rotating the tires.
we both want to be able to rotate tires.

my question is, how would it affect my car putting the 275/40/R19 x 9.5 in front to match the rear? (he would be taking my front tires)
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Old 03-31-2015, 12:03 PM   #4
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As long as the wheel clears the caliper and strut, the car will have less understeer (a bit more oversteer due to increased lateral friction potential at the front), and quicker turn in.
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Old 03-31-2015, 12:23 PM   #5
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As long as the wheel clears the caliper and strut, the car will have less understeer (a bit more oversteer due to increased lateral friction potential at the front), and quicker turn in.
makes sense. thanks!
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