Quote:
Originally posted by julian
18s and 17s have same diameter at the tread due to different tyre profiles so gearing is the same.
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Thought I'd put that to the test.
17's have 235/45, so 45% of 235 = 106mm
18's have 245/40, 20 40% of 245 = 98mm
Totals: (1" = 25.4mm)
17" = 431.8mm + (2*106mm) = 643.8mm
18" = 457.2mm + (2*98mm) = 653.2mm
This isn't exact of course, because the tyre bead sits into the rim a few mm, but it does show that there is a slight difference, even if it's much less than I first thought.
I'm not losing all hope just yet, but thanks for steering me right julian.
Lukeyson