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Old 07-16-2012, 08:18 AM   #16
wirewrkr
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Originally Posted by Airhead Wrangler View Post
I've never really though about it much, but I guess it would have to.
Not so much the rear wheel, but the diameter of the whole package, ie, the total with the tire installed. Too small a rear tire from spec and the inaccuracies of the speedo worsen, larger than stock, and you bring your speedo closer to being correct.
On my Toyota truck, when I put larger than stock tires (1 size up) the speedo went from showing 75 when doing 70 to being almost spot on. (checked with GPS)
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Old 07-16-2012, 09:54 AM   #17
bmweuro
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Originally Posted by Beater View Post
I didn't know that. That IS annoying. Do you know if the 'W' metric takes into account the diameter of the rear wheel?
It takes into consideration the stock recommended tire from BMW 4.00/18.
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