Thread: 1998 GC8 tyre placard pic
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Old 09-06-2013, 10:45 PM
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It'll be your rolling circumference -

Original size tyre was 205/50R16 circumference of 1921mm
225/40R18 circumference 2002mm.

Would need to run 225/35R18 to get back to 1931mm.
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