Z4 M Definitive Wheel Spec Thread

[Waldorf]

DISCLAIMER : Don't tell I'm anal. I know I am

I don't have the answers YET but let's make this thread definitive and opinion-free. This thread is only for the Z4 M because the offsets are not the same (at least on the front).

Let's stick to verifiable facts about wheel dimensions and offsets. I did a bunch of research and even created a little wheel-and-offset calculator in Excel that you can download to contribute to this thread. In it, the variable numbers are in BLUE and the delta values are in RED. The EXT and INT columns are (in millimeters) the External and Internal distance between the wheel hub's face to the edge of the rim.

The reason why I'm doing this is because I want to get two sets of wheels, 19"ers staggered for summer and 18"ers identical for winter and keep the original wheels for the track.

I don't want to roll any part of my fenders, nor do I want any rubbing.

Original Z4 18" wheel sets don't seem to have the proper offset to fit correctly.

I would also prefer not to have to use any spacers, especially on the front, while keeping the track with the winter set even or marginally wider in the back.

our original wheels are the following size
F 18 x 8 ET42
R 18 x 9 ET30

The original E46 M3 CSL wheels fit really tight with the following specs:
F 19 x 8.5 ET44
R 19 x 9.5 ET27

I spoke with TC Kline about it and he reckons that the following specs will fit under the stock bodywork:
R 9 ET40, 35 and 28
R 9.5 ET25

-----------------------

Those of you who have aftermarket wheels, please post the specs that you have and comment on the fit. Let's make this thread a useful resource. As you add to it, I will maintain this first post so that the information is easily found.

-----------------------


Cheers,
Olivier

[inTgr8r]

Currently running:
Fronts = 19x8.5 ET35 with 245/35 PS2
Rear = 19x9.5 ET22 with 275/30 PS2
-------------------------------------
Rubbing:
-lowered on H&R
- just a touch of rub on fronts... plastic liner right at the fender opening, front edge
- cured with a heat gun 60 seconds / side
- no problem at rear

*note tire selection (profile) will impact clearance issues.
----------------------------------------------------
Winter:
- running non staggered with 8.5" M6 reps
--------------------------------------------
OEM wheels:
- +1 for track use

[kav]

Could you please explain how to use the calculator?

Neat Offset calculator:
http://www.1010tires.com/WheelOffsetCalculator.asp

Thanks.

[Waldorf]

i simply made mine to calculate in millimeters for more accuracy and to get the delta changes for inner and outer clearance.

the only numbers that you need to play with are the ones in blue.

of course, you can make it for another car if you changed the stock width (in) and ET (mm).

for example, i bought some wheels for the winter that are all 8" wide but ET 40 for the front and 20 for the back. the chart showed me that I needed an 8mm spacer for the rear. that way my rear track was altogether 0.6mm wider.

the 1010tires calculator is fun and it's the one that i used before i got the idea for the excel calculator, now i can have a better immediate view of my whole setup.

[unionjack]

I'll be running the following when I order my new wheels.

19x8.5 et35 on 245/35
19x10 et25 on 275/30

[M-Zed-4]

Hello, I am very new to this forum, but I just purchased a 2007 z4 m coupe. I wanted to have two sets of wheels and tires for my car (one for the track and the other for the road). I previously owned a Mercedes C32 and I purchased a set of BRABUS Monoblock IV, five-hole design, 8,5Jx18, modular, tires 225/40 ZR 18, optionally 9,5Jx18 modular rear with 255/35 ZR 18. I wanted to know if there is any way at all if these might work with my current vehicle. Any advice would be greatly appreciated. Thanks

[Malbolge]

would 8x17 ET35 E90 wheel fit the roadster without rubbing? I think it will stick out a bit, but enough to be ok for front and back or...? Or will be issues on the back as it will stick out almost 2cm..

in europe the Z comes with 16 and 17in wheels, hence the question. Does the Z need basically the usual E46 wheel offsets?

[JHastings0826]

Not sure what the offsets are for the E46 but I was offered a set of E46 M3 wheels today, price hasn't been negotiated yet, but was wondering if M3 wheels would fit on a 03 2.5i roadster? Would I need spacers in the rear cause the guy told me that the wheels are 9 inches wide and with tires they are almost 10-11 inches wide, he referenced the with of the rear tires to 12 inches.

Has anyone tried this style of wheel on a Z?

I wanted to ask and see if there would be any problems before I worked out a price with him.

[GP20]

Originally Posted by JHastings0826

Not sure what the offsets are for the E46 but I was offered a set of E46 M3 wheels today, price hasn't been negotiated yet, but was wondering if M3 wheels would fit on a 03 2.5i roadster? Would I need spacers in the rear cause the guy told me that the wheels are 9 inches wide and with tires they are almost 10-11 inches wide, he referenced the with of the rear tires to 12 inches.

Has anyone tried this style of wheel on a Z?

I wanted to ask and see if there would be any problems before I worked out a price with him.

Won't fit your car. Rear offsets are too aggressive. Putting spacers only makes it worse. You can put 4 OEM front E46 M3 wheels on your Z4 if you'd like though.

And he's running 305 rear tires on his E46 M3? Ummmmm.

[JCz04Bimmer]

I'm likely going to run an SSR CompH in 19x8.5" sizing up front. It has an offset of +43 so I may use a 5mm spacer to bring it to 38 which, from what research I've done, seems to be pretty close to perfect. I've seen people saying 35 rubs when lowered so I want to avoid that since I'll likely be lowered. But the spacer gives me the ability to go back to +43 if necessary. In the rear, I'll likely run 19x9.5" sizings with an offset of 35. Again, I could use a spacer either in 10mm or 5mm to get the fitment right.

A lot of people shy away from spacers but if you get good ones and install them right, they're fine. I use studs/nuts so its even easier to remove and swap different plates on or off!

[Z4Kevo]

I am running the 19" M3 Competition wheels.

F 19 x 8.0 ET47 - 245/35R19
R 19 x 9.5 ET27 - 285/30R19

No Rubbing at all and it looks great.

[Alpine M]

19 x 8.5 + 38 245/35/19
19 x 10.0 + 34 285/30/19

1.5" F 1.6"R drop. Mild rub in front inner fender liner. Rear is a clean fit.

[x1kc]

would stock e90/92 18'' M3 rims fit on my 05 z4 3.0L w/o rubbing?
front 245/45/18 i think? and rear is 265/40/18
ET is either 40 or 35 in the rears

[aerobod]

A very good winter tyre fitment:

O.Z. Racing Ultraleggera 18x8 ET40 front and rear with 20mm spacers for the rear.
225/45-18 tyres all around, can be rotated if desired.

[Twisted Six]

Is there any difference in the available clearances from one model to the next ???
As in Roadster=
Si=
M=

[TelfordZ4M]

Is this a good fit on a 07 M Coupe? 19X10et25 and 19X8.5et35

[xjeeper]

Originally Posted by TelfordZ4M

Is this a good fit on a 07 M Coupe? 19X10et25 and 19X8.5et35

That'll work.

[racerbruce]

i luv oz's...had an 18 in set on m s2000.

looking to purchase these (below) for the 07 z4m roadster....will these fit?

oem 18's:
front: et 42
rear: et 30

oz 18's:
front: et 40
rea: et 40

O.Z. Ultraleggera
Finish: Black Painted

Front Fitment
18x8
Offset: 40mm
Backspacing: 6.10"
Bolt Pattern: 5-120
Rec. Tire Size:225/45-18
Weight: 18.6lbs.


Rear Fitment
18x9
Offset: 40mm
Backspacing: 6.57"
Bolt Pattern: 5-120
Rec. Tire Size:255/40-18
Weight: 20.8lbs.

[aerobod]

Originally Posted by racerbruce

i luv oz's...had an 18 in set on m s2000.

looking to purchase these (below) for the 07 z4m roadster....will these fit?

oem 18's:
front: et 42
rear: et 30

oz 18's:
front: et 40
rea: et 40

O.Z. Ultraleggera
Finish: Black Painted

Front Fitment
18x8
Offset: 40mm
Backspacing: 6.10"
Bolt Pattern: 5-120
Rec. Tire Size:225/45-18
Weight: 18.6lbs.


Rear Fitment
18x9
Offset: 40mm
Backspacing: 6.57"
Bolt Pattern: 5-120
Rec. Tire Size:255/40-18
Weight: 20.8lbs.

They will fit no problem (I have the front fitment all round on my car, for my winter tyres with a 20mm spacer on the back). You may want to use a 10mm spacer on the back with 35mm long lug-bolts, although the wheel will just look a bit inset if you don't, but shouldn't rub.

[racerbruce]

Originally Posted by Waldorf

DISCLAIMER : Don't tell I'm anal. I know I am

I don't have the answers YET but let's make this thread definitive and opinion-free. This thread is only for the Z4 M because the offsets are not the same (at least on the front).

Let's stick to verifiable facts about wheel dimensions and offsets. I did a bunch of research and even created a little wheel-and-offset calculator in Excel that you can download to contribute to this thread. In it, the variable numbers are in BLUE and the delta values are in RED. The EXT and INT columns are (in millimeters) the External and Internal distance between the wheel hub's face to the edge of the rim.

The reason why I'm doing this is because I want to get two sets of wheels, 19"ers staggered for summer and 18"ers identical for winter and keep the original wheels for the track.

I don't want to roll any part of my fenders, nor do I want any rubbing.

Original Z4 18" wheel sets don't seem to have the proper offset to fit correctly.

I would also prefer not to have to use any spacers, especially on the front, while keeping the track with the winter set even or marginally wider in the back.

our original wheels are the following size
F 18 x 8 ET42
R 18 x 9 ET30

The original E46 M3 CSL wheels fit really tight with the following specs:
F 19 x 8.5 ET44
R 19 x 9.5 ET27

I spoke with TC Kline about it and he reckons that the following specs will fit under the stock bodywork:
R 9 ET40, 35 and 28
R 9.5 ET25

-----------------------

Those of you who have aftermarket wheels, please post the specs that you have and comment on the fit. Let's make this thread a useful resource. As you add to it, I will maintain this first post so that the information is easily found.

-----------------------


Cheers,
Olivier

06-07 mz4 oem wheel weight....
what is the exact weight for front and rear oem wheels??

thanks
racerbruce

[racerbruce]

06-07 mz4 oem wheel weight....
what is the exact weight for front and rear oem wheels??

thanks
racerbruce

[AWM3]

Originally Posted by racerbruce

i luv oz's...had an 18 in set on m s2000.

looking to purchase these (below) for the 07 z4m roadster....will these fit?

oem 18's:
front: et 42
rear: et 30

oz 18's:
front: et 40
rea: et 40

O.Z. Ultraleggera
Finish: Black Painted

Front Fitment
18x8
Offset: 40mm
Backspacing: 6.10"
Bolt Pattern: 5-120
Rec. Tire Size:225/45-18
Weight: 18.6lbs.


Rear Fitment
18x9
Offset: 40mm
Backspacing: 6.57"
Bolt Pattern: 5-120
Rec. Tire Size:255/40-18
Weight: 20.8lbs.

You need to use a 15 mm spacer on the back with those wheels with either wheel studs or correspondingly longer wheel bolts. Readily available from several reputable vendors.