Z4 (non-M) Definitive Wheel Spec Thread

[JD3]

I noticed the Z4M thread and thought I'd start one for the other Z4's. I've searched high and low and am having a tough time finding much information on wheel offset options, hopefully you all can help me fill in the blanks! Please specify which model it is (if it matters). I apologize if there's already one of these, but I didn't find one.

-Stock Z4 SI 18" Wheel Offsets
-Front = 8" et = ?
-Rear = 8.5" et = ?
-Front Weight = ?
-Rear Weight = ?

-How aggressive have you got with offsets and tire sizes?

[Incompatible]

Factory 203 wheels
18x8 et 47 wgt 26.3 lbs
18x8.5 et 50 wgt 26.5 lbs

D-Force Empower wheels
18x8.5 et 40 wgt 19.2 lbs
18x9.5 et 43 wgt 20.9 lbs

Sport suspension
OE tires sizes: F-225/40 R-255/35
No rub, good clearance
Weights determined on a postal scale.

And because it is regularly asked:
Wheel Bolt Torque = 120 nm +/- 10 (81.1 - 95.9 ft lbs) (120nm = 88.5 ft lbs)

[vortex_tuning]

For Non-M on stock suspension, 19x8.5 ET30 and 19x9.5 ET40 should give you pretty flush stance.

If the car is lowered then it all depends on your supsension setup. But 19x8.5 ET35 and 19x9.5 ET43 should work really well if your suspension is not extreme.

[JD3]

Thanks for contributing, good info for all the non-M'rs out here!

[nickpapa]

im running VMR CSL reps

19x8.5 with 40mm offset up front and 19x9.5 with 45mm offset in the rear.

fronts have 235/35 and rears have 265/30

im lowered on eibach springs and koni shocks and i have absolutely no rubbing whatsoever even with a second passenger

[JD3]

Originally Posted by nickpapa

im running VMR CSL reps

19x8.5 with 40mm offset up front and 19x9.5 with 45mm offset in the rear.

fronts have 235/35 and rears have 265/30

im lowered on eibach springs and koni shocks and i have absolutely no rubbing whatsoever even with a second passenger

What's the most offset one can run with a 9.5" wheel? Some of the e90 guys run 9.5" with 25 offset. Would that basically push the wheels out about another inch and a half over stock? Is that offset acceptable on the Z4, or is it too aggressive?

[misterawa]

Originally Posted by JD3

What's the most offset one can run with a 9.5" wheel? Some of the e90 guys run 9.5" with 25 offset. Would that basically push the wheels out about another inch and a half over stock? Is that offset acceptable on the Z4, or is it too aggressive?

You can run with a 19X9.5" rear wheel with a 35 offset. On my last set of wheels (Miro Type 366s) i ran a 19X8.5" front and 19X10" rear with a 35 offset all around. I recall someone running a 32 offset in the rear.

Keep in mind that these measurements are with 265/30/19 rear tires.

[JD3]

Originally Posted by misterawa

You can run with a 19X9.5" rear wheel with a 35 offset. On my last set of wheels (Miro Type 366s) i ran a 19X8.5" front and 19X10" rear with a 35 offset all around. I recall someone running a 32 offset in the rear.
Keep in mind that these measurements are with 265/30/19 rear tires.

Thanks, that helps a lot.
So if you're running a 35 offset on a 10" then you should be safe with as low as 29 I'd say on a 9.5". At least that's what my math would say. 25 is probably still too aggressive, even with 265/30's.

[misterawa]

Originally Posted by JD3

Thanks, that helps a lot.
So if you're running a 35 offset on a 10" then you should be safe with as low as 29 I'd say on a 9.5". At least that's what my math would say. 25 is probably still too aggressive, even with 265/30's.

A 29 offset may be pushing it . IMO, I would go no lower than a 32 offset.

[JD3]

Originally Posted by misterawa

A 29 offset may be pushing it . IMO, I would go no lower than a 32 offset.

Good info, I'd say you're right.

[Juice84]

How different is our rear from Z4m? I notice a lot of them run 2x offset on 18x10 wheels?

[zKnuds3712]

I have 18x8.5's et38 all the way around. anyone have any tire suggestions for the best fitment? I've been thinking about 225-35-18.

[v3.0si]

bump for a great thread!

i've noticed a lot more questions and posts coming in for non-///m wheel and tire fitment, so i'm hoping to get this thread to "sticky" levels soon.

these specs are for getting the wheel out flush (not past) the fender line on stock suspension and little need to add negative camber front or rear.

for the front...

8.5" width = et35
8.0" width = et29

for the rear...

9.5" width = et42
9.0" width = et35
8.5" width = et29

i'm personally running...

style = oem style 313 (stock, off an E92 335is)

please excuse the crappy camera phone pics...





specs =
front = 18" x 8.0" et34 with 225/40r18
rear = 18" x 8.5" et37 with 255/35r18

weights =
front = 22.1 lbs ( +- 0.3 lbs, according to the scale mnfr )



rear = 23.4 lbs ( +- 0.3 lbs, according to the scale mnfr )



suspension = ZSP stock (for now)

04.09.2011 - !!!UPDATED PICS!!!













now, i know a bunch of you... dubbedown, ljs, stigj, misterawa, oh fo sho, mister roger, dadoke... all have aftermarket wheel setups. get your specs in here and we'll give the mod's a reason to keep this thread on the first page!

and don't forget to post pics!!!

[evoq007]

YES please post pics too!!

[StigJ]

Current setup:
Front: 9x19" ET44 with 235/35-19 (Yokohama Advan Sport)
Rear: 9x19" ET44 with 255/30-19 (Yokohama Advan Sport)

Lowered 35mm with H&R springs.
No alignment done yet...

A little rub in the front just behind the side reflectors in the inner wheelwell.






New wheels are purchased but not on the car yet. Will post the specs when it on the car.

[Twisted Six]

Very cool. Whats your impressions of the new ride or feel ??

[v3.0si]

check out my updated pics in my first post...

please excuse the truely crappy cell phone pics!

[evoq007]

Want to see offset on car! Comeon spring.

[DSC_OFF]

Just to add, I'm currently running:

Volk RE-30 in 18x8.5 et42 on all 4 corners

No rub whatsoever, and that's with a 12mm spacer on the rear, effectively giving me a 30mm offset

225/40-18 tires but will be upgrading to 255/35 shortly

[v3.0si]

Originally Posted by evoq007

Want to see offset on car! Comeon spring.

i don't have anything on mine yet... it snowed here this morning, and we're to get more wednesday. oh well.

in the mean time, "rlc" has the same offsets. use your imagination to lower the car down to ZSP height...
http://www.zpost.com/forums/bpgarage...o=view&id=2207

and here is a chop with 313's on it... (best viewed from about 6+ feet away from your monitor, don't ask me why... it just works)

[Zabi]

I'm still curious as to what the difference between the rear of an M vs non-M really is? as far as I can gather the sheet-metal is the same for the two vehicles and the front offsets are essentially identical. Does the M have a different offset because the axles/hubs/brakes? or something that is drastically different?

[DSC_OFF]

Originally Posted by Zabi

I'm still curious as to what the difference between the rear of an M vs non-M really is? as far as I can gather the sheet-metal is the same for the two vehicles and the front offsets are essentially identical. Does the M have a different offset because the axles/hubs/brakes? or something that is drastically different?

The whole rear end... subframe, suspension, brakes, etc is different bet the 2 cars.