997 Turbo / GT2 2006–2012 Turbo discussion on the 997 model Porsche 911 Twin Turbo.
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bigger tire size on stock wheels?

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Old 06-28-2011, 12:21 PM
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bigger tire size on stock wheels?

I was wondering if i could put 245/35/19 tires on the front stock wheels, considering i have stock 305/30/19 in rear.

Worried about burning the differential.

Also would this benefit the handling?
 
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Old 06-28-2011, 01:30 PM
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Any opinions? Need to order tires soon lol
 
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Old 06-28-2011, 01:47 PM
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HeY Sam,

Check out this thread here:

https://www.6speedonline.com/forums/...-will-fit.html

Has some very interesting info and a link to an online tire size calculator.

Also, PM Daemon at Tirerack. Knows his stuff.

Hope this helps.
 
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Old 06-28-2011, 03:47 PM
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thanks bro. According to the calculator it will be less than 1.5% change.

My question is tho, how will understeer/oversteer be affected? As well as the drive of the car.

Additionally will it rub? I ahve 7mm spacers infront with H&R springs
 
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Old 07-05-2011, 11:40 AM
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bump, please someone give me a solid answer?
 
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Old 07-05-2011, 01:01 PM
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Why change from stock? Looks?
 
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Old 07-05-2011, 01:32 PM
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noo i was thinking 245 upfront to reduce understeer and make heavier steering

just concerned about rubbing because i am lowered with h&r springs as well as 7mm spacers upfront
 
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Old 07-05-2011, 11:17 PM
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I ran (I believe) that size when I went to PS Cups. I went through two sets of cups without any damage but it would lunge back and forth at low speed engine braking. The dealer was on about some issue of the PCM miscalculating the rotations of front and rear wheels in relation. I didn't believe them until I went back to stock PS2s and the problem stopped.

A 1.5% difference won't get anywhere near burning out the differential. It's a slow grind for the rare instances your differential is actually supposed to be static. Much like your front and rear diffs, the center one is always giving, and a slight diameter change won't exacerbate that much. But there might be some other symptoms.
 
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