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      07-30-2011, 10:36 PM   #12
elm3
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Drives: '09 E92 M3 IB/'17 f85 X5M LBB
Join Date: Sep 2008
Location: Canton, GA.

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2017 BMW / X5M  [5.00]
2009 E92 M3  [5.00]
2004 Yamaha R1  [5.00]
[quote=Mace;10131128]As others have said it's measured at the transmission not at the wheels. When it comes to changes due to wheel diameters only the rear tire diameters matter because they're the drive wheels.[/QUOTE

+1 there is a speed sensor on the tranny.
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'09 E92 ///M3 Interlagos Blue,6MT,Silver Novillo Leather,CF Trim,Premium Package,Technology Package,Cold Weather Package,Premium Sound,19"Wheels,Moonroof-Toy/'17 X5M, Long Beach Blue, Executive Package,Technology Package, Lighting Package, Driver Assist, Full Mughello Red Interior 21" wheels-Toy/'14 i3 MegaWorld 19"wheels-Daily