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Discussion Starter #1
Any idea how to re-calibrate your speedometer after putting on 18's?
 

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You may not have to. As long as the TOTAL DIAMETER of the wheel and tire remains the same (ex, 17" wheel, with a 45 profile VS an 18" wheel with a 40 profile = same total diameter), you will not need to.

Measure the tire diameter VS the aftermarket 18's you just strapped on. Good luck.
 

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Discussion Starter #3
It's definately off. The new set up is much bigger.
 

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:doh:

Track sizes are :

Front - Rays Engineering 8.0JJ x 18" Forged Alloy Wheels (+30mm offset / 8.1kg) with 225/45 R18 91W Bridgestone Potenza RE040

Rear - Rays Engineering 8.5JJ x 18" Forged Alloys (+33mm offset / 8.3kg) with 245/45 R18 96W Bridgestone Potenza RE040

so you don't need re-calibrating - you've increased the size of your rim, but decreased the size of the tire sidewall
 
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