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Old 10-04-2008, 01:31 AM
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greyish greyish is offline
tire consumer
Location: huntsville, al
Join Date: May 2007
Posts: 555
Mein Auto: 99 z3c
daven is correct. Stock 17"s on a non-M Z3 have an offset of 41mm on all four wheels.

Assuming that the wheels from your E90 325i sport package are Style 161

Z3 fronts: 7.5" wide; et 41
325i fronts: 8.0" wide; et 34
Difference: Inner Clearance = +1mm; Outer edge = +13mm (roughly 1/2 inch).

Z3 rears: 8.5"; et 41
325i rears: 8.5"; et 37
Difference: Inner Clearance = +4mm: Outer edge = +4mm (roughly 1/6 inch).

[ "+" in this case means shifting away from the centerline of the car; e.g. engine/driveshaft. ]

This is all based on the assumptions that these are the 325i wheels that you have and that the ones currently on your Z3 are 17x7.5"f and 17x8.5"r, which are very common.

Also, here is a calculator for future use.

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