F80 M3 / F82 M4 Wheel Offsets (ET) and Sizes

[Sedan_Clan]

Originally Posted by mkoesel

Read carefully, you appear to still be confused.

Spacers will not be necessary to get offsets that meet or exceed OEM specifications.

Thank you guys for setting him straight.

[dmk08]

Now I just need to decide what color I want my wheels and 19s or 20s. Gotta have the HREs ready to put on at delivery!

[jbockrd]

Originally Posted by KennyPowers

need widths and offsets to answer your question

use the calculator I provided in my prior post and plug in your wheels and the OEM bmw winter wheel data provided in the OP in this thread.

Ok thank you Kenny

John

[hellrotm]

Originally Posted by GregD

I'm surprised these offsets are so high? Were E9x M offsets the same?
I was expecting something like 10" with an ET of 25-30mm.

Yeah, especially the rear offset. Very high (for a M3).

[Dave2011M3]

Originally Posted by KennyPowers

I don't think you understand wheel offsets.

The OEM ZCP wheels vs F8x wheels are

19x9 ET 31 vs 19x9 ET 29 - -2mm for F8x
19x10 ET 25 vs 19x10 ET 40 - +15mm for F8x

So basically, swapping ZCP on the new F8x would be 2mm less aggressive in the front, and 15mm more aggressive in the rear. So you could get a nice flush fitment by running ZCP and say a 12-15mm spacer in the front with no spacer in the rear.

All depends on fender clearance and how the OEM wheels fit on the F8x. We will find out how much room they have once the cars are in our position and we can take some measurements.

Exactly...

[Dawko]

Originally Posted by BlackJetE90

Yeah, especially the rear offset. Very high (for a M3).

Just as I thought. These specs are used by the 335i/435i crowd for aftermarket wheels?

How about just a little more agressive BMW?

[Chill72]

Originally Posted by KennyPowers

this is the best tool for making these calculations....

http://www.1010tires.com/Tools/Wheel...ulator#Results

first of all, I wouldn't recommend a narrower wheel like that, its important to have wider wheels that support the sidewalls fully. BMW engineers in slightly stretched wheels/tires which IMO help decrease body roll and aid in steering sharpness. so I would highly recommend at least a 9/10 inch width, especially with a 255/275 tire.

that said, here are the results.

fronts will be 8mm more aggressive than stock (should definitely fit and be noticeably more aggressive, but not overly aggressive.

rears will be 12mm more aggressive than stock, and look about right.

again, I wouldn't recommend narrower wheels, but it can be done and it will fit.

its hard to say what the most aggressive fitment is, because we don't know how much more offset the car can take and still fit in the fenders. it also depends on if you will lower your car etc....

Thanks for that calculator. I never fully understood offsets but I grasp it now 100%.

[StealYourFace]

I really like the winter wheels.

The 641 as it turns out, was on quite a few of the camo cars for the past couple years. It reminded me of a bbs f1. I think it looks better than the 437.

[EuroTrip]

If you love the ZCP wheel so much, buy another two rears and run square 19x10 et25. That will look good and relatively aggressive.

[metrickid]

Originally Posted by GregD

Just as I thought. These specs are used by the 335i/435i crowd for aftermarket wheels?

How about just a little more agressive BMW?

It is exactly the same offsets (converted) I have on my HRE's on my F30 335i. But you can easily fit more aggressive wheels on the F8x so it shouldn't be a problem.

The only advantage with more aggressive offsets is more concave wheels?!

[Savory]

This is great news. Shows that BMW was very conservative with wheel fitment. No wonder the rears are so sunk in the fender. You can easily stick on the ZCP E9X wheels and they should sit nearly flush without spacers! I thought BMW kept the same offsets as the E9X but it was so far inward forcing people to resort to really low to negative offsets if they wanted to fill the gap. That would limit aftermarket wheel options.

[pkimM3r]

there goes the super deep concaves!

[Mako]

So right now I have 18X8.5 winter wheels for my F30 with 35 offset.

am I correct in thinking that I would need 8mm spacers for the front and 12mm spacers for the rear to work with the F80?

I really like the winter wheels I have and spent a little extra than normal to get them, would hate to have to sell them and buy new ones but have also never used spacers.

EDIT:
just used the wheel calculator so it says on the rear wheels the "inner clearance is the same" but out position would "retract by 12mm" on the front wheels it says "inner clearance 8mm less" and "retract by 8mm"

[Sedan_Clan]

Originally Posted by Savory

This is great news. Shows that BMW was very conservative with wheel fitment. No wonder the rears are so sunk in the fender. You can easily stick on the ZCP E9X wheels and they should sit nearly flush without spacers! I thought BMW kept the same offsets as the E9X but it was so far inward forcing people to resort to really low to negative offsets if they wanted to fill the gap. That would limit aftermarket wheel options.

As I have suspected for weeks, but a few chose to argue with me about it. I'm glad that it turned out to be the case.

Originally Posted by GregD

Just as I thought. These specs are used by the 335i/435i crowd for aftermarket wheels?

How about just a little more agressive BMW?

Yep, we run some really aggressive wheels, so the F8X will be able to as well.

[dmk08]

So do people refer to the 18s as 'winter wheels'? Is that what I'm missing here.

[jphughan]

Originally Posted by GregD

Just as I thought. These specs are used by the 335i/435i crowd for aftermarket wheels?

How about just a little more agressive BMW?

If the hubs are farther outboard relative to the edge of the fender than the E9x, then a higher positive offset doesn't necessarily translate to a less aggressive setup. Obviously a lower offset AND a wider hub stance would me more aggressive still, but offsets by themselves aren't evidence of a more conservative setup relative to another car.

[jphughan]

Originally Posted by dmk08

So do people refer to the 18s as 'winter wheels'? Is that what I'm missing here.

There are different style codes for the summer and winter 18s.

But wow, winter 19s?? Did the E9x have those available OEM? And are the winter wheels designed differently to deal with lower temperature somehow, or is it just an alternate style with narrower wheels to allow skinnier tires? Too bad only the winter 19s are square to allow rotation, too.

[Boss330]

Originally Posted by pkim1079

there goes the super deep concaves!

Why?

With a +40mm offset on the rears you have much more possibility to go to a more concave +25 or lower aftermarket wheel...

A +40mm offset means that the wheel hub mounting flange is 40mm from the wheel centerline towards the outside of the wheel. A aftermarket wheel with a +25 offset means that the mounting flange has been moved 15mm further inwards towards the wheel centerline, i.e a deeper dish/more concave wheel is made possible.

[Needsdecaf]

Originally Posted by jphughan

But wow, winter 19s?? Did the E9x have those available OEM? And are the winter wheels designed differently to deal with lower temperature somehow, or is it just an alternate style with narrower wheels to allow skinnier tires? Too bad only the winter 19s are square to allow rotation, too.

19's are required to clear the CCB's. So you would need winter 19's if so equipped.

[Ghetto2315]

Obviously going with out any spacers is the best option but are there are any real serious negatives of using spacers regardless of size?

[Black Gold]

Originally Posted by jphughan

If the hubs are farther outboard relative to the edge of the fender than the E9x, then a higher positive offset doesn't necessarily translate to a less aggressive setup. Obviously a lower offset AND a wider hub stance would me more aggressive still, but offsets by themselves aren't evidence of a more conservative setup relative to another car.

Originally Posted by Boss330

Why?

With a +40mm offset on the rears you have much more possibility to go to a more concave +25 or lower aftermarket wheel...

A +40mm offset means that the wheel hub mounting flange is 40mm from the wheel centerline towards the outside of the wheel. A aftermarket wheel with a +25 offset means that the mounting flange has been moved 15mm further inwards towards the wheel centerline, i.e a deeper dish/more concave wheel is made possible.

these

there are a lot of people posting in this thread who do not understand wheel fitment or offsets...

[richardg]

Was really hoping the 641M would be 10 in the rear but that would defeat the purpose of a winter wheel

That just had to be the sexiest design too