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      03-19-2019, 06:12 AM   #1
Joe240
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2019 and 2020 g29 z4 wheel specs

Factory specs below:

Bolt pattern: 5x112
Center Bore: 66.6mm
Bolt: M14 x 1.25
Torque: 140nm (103 ft lbs)

Factory 18s:
8"x18"et20
9"x18"et28
225/45 front tire
255/40 rear tire

Factory 19s:
9"x19"et32
10"x19"et40
255/35 front tire
275/35 rear tire



Here are some wheel options that were pulled from Tire Rack (TR) and 1010tires. Both have been reliable in the past for aftermarket wheels that fit on stock suspension without any modifications:

FRONT:
9et35 - 3mm closer to strut, 3mm further from fender (TR)
9et30 - 2mm from strut, 2mm closer to fender (1010tires)
9et25 - 7mm from strut, 7mm closer to fender (1010tires & TR)
9et20 - 12mm from strut, 12mm closer to fender (1010tires)
9.5et30 - 4.3mm closer to strut, 8.3mm closer to fender (TR)
9.5et25 - .7mm from strut, 13.4mm closer to fender (TR)
9.5et26 - .3mm closer to strut, 12.4mm closer to fender (2018 m5 19" wheel)


REAR:
10.5et30 3.7mm from strut, 16.4mm closer to fender (1010tires)
10.5et42 8.3mm closer to strut, 4.3mm closer to fender (TR)
10.5et38 4.3mm closer to strut, 8.3mm closer to fender (TR)
10.5et35 1.3mm closer to strut, 11.4mm closer to fender (TR)
10.5et28 5.7mm from strut, 18.4mm closer to fender (2018 m5 19" wheel)

The M5 19" wheels should theoretically fit since they fall within the ranges confirmed by TR and 1010tires (with the exception of the rear 10.5" which is only off by 2mm from a confirmed fit).


If you're looking for more grip, then MPS4S are the best out there without going streetable autocross/track tires.
275/30ZR19 MPS4S Recommend 9.5" wheel ($312.99)
295/30ZR19 MPS4S Recommend 10.5" wheel ($349.99)
305/30ZR19 MPS4S Recommend 11" wheels, but the mounting range starts at 10.5" ($377.99)

Yes, the 275/30 and 295/30 are smaller overall diameter than the factory 255/275, but only marginally and would cause a speedo error of ~2%, or .6mph (speedo reads 30mph, you're actually doing 30.6mph, radar gun would probably read 31-32mph depending on level of accuracy).

Last edited by Joe240; 05-22-2019 at 08:39 PM..
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Jim S155.50

      05-22-2019, 08:45 PM   #2
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Did some measurements this evening on inner and outer clearances for front and back wheels. Finding wheels that would sit within these measurements will allow the 275/295 wheel setup.

Front:
5mm from strut
8mm from fender

Rear:
25mm from strut
15mm from fender

Updated the OP as well to reflect this. Wheel sizes in Red will still fit the vehicle, but smaller width tires will be needed (255 in front instead of 275, 285 in back instead of 295).

Also, the m5 wheels will fit, but there would be ~1-3mm of poke on the wheels, so smaller tires would be required (again, 255/285 would probably be best).
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