C6 Grandsport Max Tire size diff (front/back)


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Donating Member
Aug 5, 2014
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So I am trying to figure out the limits of the computer.

Stock front OD is 25.6 (275/35-18)
Stock Rear OD is 26.7 (325/30-19)
Difference of 1.1 (front to rear)

What is the maximum difference I can go without making the computer wig out? Anyone know?

My current set up:

Front OD 25.7 (285/30-19)
Rear OD 26.8 (345/25-20)
Difference 1.1 (same as stock)

Trying to figure out how to get a DR on the back but its a bitch to find a size without needing new rear wheels.

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