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Correct Tire Diameter Ratio for 99 Carrara 4 for New Wheels

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YOUR RESEARCHCorrect Tire Diameter Ratio for 99 Carrara 4 for New Wheels

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Adjust accordingly

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Fenders are rolled and camber will be adjusted accordingly.

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Correct Tire Diameter Ratio for 99 Carrara 4 for New Wheels
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Adjust accordingly

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Performed · outcome unconfirmed · Original poster

Fenders are rolled and camber will be adjusted accordingly.

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Correct Tire Diameter Ratio for 99 Carrara 4 for New Wheels
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POST 1 / ORIGINAL POSTEROriginal post

Hello, I just purchased wheels that are 18x9 +46 and 18X11 +50. Fenders are rolled and camber will be adjusted accordingly. The purpose of the car is a weekend canyon car. Not sure about track days yet, but that is not completely out of the picture. Apex Wheels website recommends 235/40 and 295/30 (GT3 Tire), but I believe the 235/40 up front is a bit stretch looked on a 9" Wide wheel. I was thinking of going 245/40 up front and 295/30 in the rear. But is the diameter ratio correct for the system to not throw any PSM and ABS codes? Or would I have to go up to 315/30 in the rear? I've searched for days, and cannot seem to get a solid answer.

POST 2Original post

As a fellow C4 owner I would go 245/40 and 285/35. That gives you a front diameter of 25.7" and rear 25.9"... Which is within 3% of the original 25.1" front, 25.3 rear and you still keep the same 0.2" split front to rear. 235/40 = 25.4" 295/30 is only 25" so your front would be taller than this rear.

POST 4Original post

Quotes source post: 18633639

Hey, new rims, nice. Seems like you had my02s. What are these offsets?

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