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      08-19-2019, 04:59 PM   #3
Joe240's Avatar

Drives: 2020 Z4 M40i
Join Date: Jul 2016
Location: Pensacola

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2020 Z4 M40i  [0.00]
2019 BMW X3 M40i  [0.00]
Using the ECSTuning spacer fitment rental kit, I found the following spacers will bring the wheels flush with the fenders:

8mm front
12-13mm rear (12.5mm is exactly flush)

ECSTuning offers a 12.5mm spacer for the rear with extended lug nuts, but other manufacturers may only offer 12 and 13mm. This is why I did a range instead.

If looking at aftermarket wheels, the following sizes would clear the fender and suspension. The lower offsets would make the wheels flush, so they are advised for stock suspension only, not lowering springs:

19 x 9.5 et30 to et33 ideal for front 275/35 (or 275/30)
19 x 9 et24 to et40 ideal for front 255/35
19 x 11 et42 to et48 ideal for rear 305/30
19 x 10.5 et35 to et52 ideal for rear 295/35 (or 295/30)