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Discussion Starter #1
over the next few months i am pretty set on purchasing some 18x7.5 6-spoke wheels (gunmetal w/ polished lip) for my DT green cougar... (after coilovers of course)

-- 40 series tires would be easy to come by, would they throw my OD off a huge bit or would i be okay
-- I heard rumors from an amigo a long time ago that modern cars (i.e. 99 cougar) can be electronically recalibrated to the correct wheel rpm/speedo mph ... any truth to this?

thanks
 
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Discussion Starter #2
going to 18s with the 225 40s will throw it off by 1.5 something or other...it will read slower than u are going....and yes they can be recalibrated if u know someone with an obd2 speedo tuner or of course the custom burned chip to those wheel tire combo
 

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So stock is 215/50/16, right?

I've got 18" x 7.5 Velox rims... what would the other numbers be? Damn, I wish I wasn't working so I could just pop down to my garage, get the numbers, and figure this out.... I'm too curious :)
 
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