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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Wheels and Tires Forum Sponsored by The Tire Rack > Typical wheel offset help



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      08-23-2019, 09:54 AM   #1
team7
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Typical wheel offset help

First off I have a 2009 E91 328xi wagon with KWv1 coils.

Ive been doing a bunch of research but part of my confusion comes with any possible offset differences between wagons and sedan awd so I have been trying to limit my research to other LCI xi wagons which significantly limits my results. When I do find one with wheels they aren't lowered or they are wide body m3 conversion.

Any help would be great. Looking at either 19x9.5 +35 or 19x8.5 +25 and would like to need or be close to needing a fender roll. Ok with square setup or staggered. If I need to run a small spacer to get the fitment just right so be it. Would also like to know what size tires to run...

I was trying to work through how offset calculates with wheel width. Is 10mm of offset equal to .5in of wheel width or is it not that simple? So are the sizes I listed above basically the same fit? Thanks for the help.
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      08-23-2019, 03:05 PM   #2
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Quote:
Originally Posted by team7 View Post
...
I was trying to work through how offset calculates with wheel width. Is 10mm of offset equal to .5in of wheel width or is it not that simple? So are the sizes I listed above basically the same fit? Thanks for the help.
Have you read the tirerack.com articles on offset? https://www.tirerack.com/wheels/tech...jsp?techid=101

Offset doesn't affect wheel width, only the positioning of the wheel (and tire) within the wheel well. Take the most common problem: people try to fit M3 wheel/tires on a regular 3-series. They don't (really) fit, as the M3 has much lower offsets than the regular, so they stick out too far and rub.
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      08-23-2019, 05:45 PM   #3
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Yes im very well aware that offset and width are not related. I phrased that part of my question wrong. I meant to ask will those two wheels specs sit the same in the wheel well. So 10mm of offset pushes the wheel .5in out or in from the hub. However my main question is what will fit the car the best. Thanks
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      08-24-2019, 01:23 AM   #4
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Quote:
Originally Posted by team7 View Post
Yes im very well aware that offset and width are not related. I phrased that part of my question wrong. I meant to ask will those two wheels specs sit the same in the wheel well. So 10mm of offset pushes the wheel .5in out or in from the hub. However my main question is what will fit the car the best. Thanks
Couldn't tell you what will fit. Some of the problems are due to the fact that tread widths differ from manufacturer to manufacturer even though they both say 226/40R18 (for instance). Sometimes you have to try.

Read this thread, I think there's enough discussion (it's a long thread unfortunately) that will clarify your questions.
https://f30.bimmerpost.com/forums/sh....php?t=1133583
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      09-02-2019, 07:41 AM   #5
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Quote:
Originally Posted by floydarogers View Post
Take the most common problem: people try to fit M3 wheel/tires on a regular 3-series. They don't (really) fit, as the M3 has much lower offsets than the regular, so they stick out too far and rub.
This might be true for LCI sedans and any coupes/verts, but pre-LCI sedans have more space for aggressive wheels at the rear and OEM M3 wheels are essentially a perfect fit.

I use style 220 in summer, and 219 in winter. I did roll my fenders, and can't run OEM M3 tire sizes, but with non-M tires they fit just fine.

Also, I find the website www.willtheyfit.com a tremendous resource for seeing what may or may not fit your specific car. It compares your current setup with specs of a new setup you're interested in, and tells you how much more poke etc it has compared to current. Then you measure that against your car to see if you have the room to clear the new setup!
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      09-02-2019, 02:14 PM   #6
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Quote:
Originally Posted by Ali-323i View Post
This might be true for LCI sedans and any coupes/verts, but pre-LCI sedans have more space for aggressive wheels at the rear and OEM M3 wheels are essentially a perfect fit.
AFAIK, pre-LCI and LCI cars have no differences in the rear wheel wells. In fact, realoem.com shows the same rear quarter panel used in both: https://www.realoem.com/bmw/enUS/par...&q=41217145095

They also have the same wheels specced for all E9x years.
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      09-02-2019, 06:03 PM   #7
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Quote:
Originally Posted by floydarogers View Post
Quote:
Originally Posted by Ali-323i View Post
This might be true for LCI sedans and any coupes/verts, but pre-LCI sedans have more space for aggressive wheels at the rear and OEM M3 wheels are essentially a perfect fit.
AFAIK, pre-LCI and LCI cars have no differences in the rear wheel wells. In fact, realoem.com shows the same rear quarter panel used in both: https://www.realoem.com/bmw/enUS/par...;q=41217145095

They also have the same wheels specced for all E9x years.
The sedans do have a difference. LCI models have a wider axle or shaft (I don't know the name of the part), the panels are the same. I think I read it's an 8mm difference, don't quote me on that.

Not sure about wagons, no difference in coupe or vert.
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      09-02-2019, 07:18 PM   #8
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Quote:
Originally Posted by Ali-323i View Post
The sedans do have a difference. LCI models have a wider axle or shaft (I don't know the name of the part), the panels are the same. I think I read it's an 8mm difference, don't quote me on that.

Not sure about wagons, no difference in coupe or vert.
Sorry, you're wrong. The half-shafts are common on E90, E91, E92 for all years: https://www.realoem.com/bmw/enUS/par...&q=33207604592

Same with the suspension bits: https://www.realoem.com/bmw/enUS/sho...diagId=33_1230
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      09-02-2019, 07:42 PM   #9
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Quote:
Originally Posted by floydarogers View Post
Sorry, you're wrong.
https://www.e90post.com/forums/showthread.php?t=241718

https://www.e90post.com/forums/showthread.php?t=451207

I can find more, but I think that should suffice.
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      09-02-2019, 07:47 PM   #10
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If the links above aren't enough, use my own car as an example, Pre-LCI E90. No issues with OEM M3 wheels, despite being lowered. Flush fitment, no poke.

Quote:
Originally Posted by floydarogers View Post
people try to fit M3 wheel/tires on a regular 3-series. They don't (really) fit, as the M3 has much lower offsets than the regular, so they stick out too far and rub.
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      09-02-2019, 08:13 PM   #11
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Quote:
Originally Posted by Ali-323i View Post
I can find more, but I think that should suffice.
The wheel carriers are different LCI versus pre-lci. Only part I didn't check on.

But, I suspect that a loaded car will rub around the rears, and full-lock may be a problem at the front. Ever experienced any rubbing?
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      09-02-2019, 08:21 PM   #12
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Quote:
Originally Posted by floydarogers View Post
Quote:
Originally Posted by Ali-323i View Post
I can find more, but I think that should suffice.
The wheel carriers are different LCI versus pre-lci. Only part I didn't check on.

But, I suspect that a loaded car will rub around the rears, and full-lock may be a problem at the front. Ever experienced any rubbing?
Rubs rarely on large bumps at high speed only. And the fronts, not the rear.
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      10-31-2019, 09:41 AM   #13
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Hey guys just wanted to circle back in case anyone else needs help on this. When shopping for wheels you are usually held to what the brand offers instead of the offset specs you want. The brand I when with offered a more aggressive offset but when I ordered it they said it wasn't available.

I went with, on a 2009 E91 LCI 328ix, 8.5 + 33 and 9.5 +35. I then added 5mm spacers all around which did cause the back to rub while excelerating in a corner. So a little compression in a corner causes a slight rub with no fender roll. Keep in mind I am lowered as far as the KW V1 allows. I will roll the fenders in the near future. I am not sure if I could fit much more offset in the back without a good stretch.

In the front I plan to swap out the 5mm spacer and run a 10mm spacer, however I think most people would be happy with how it sits. Hope this helps some people.

Oh and tires im running 235/35/19 and 265/30/19
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