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      04-22-2014, 02:02 PM   #1
andrey_gta
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2008 BMW 128i  [0.00]
Solving Rear Wheel fitment by Swapping Rear hub to lower offset & reduce fender work

Hey guys, so recent threads about fitting track & lightweight wheels pointed out the need to modify the fender in the Rear to fit 17x8.5 et 40 wheels such as APEX or D-force LTW. (NOTE: 17x8 et 40 will fit, but wide tire choice may cause some issues, still less that 8.5 wheels)
Having accepted the facts and in general how hard it is to fit wheels for the 1 series coupe i parked the issue. Than randomly, I had to search for a 1 series manual in digital form and I found this file and it talked about wheel hubs!!
See Pg 18 - Wheel hubs : http://www.1addicts.com/goodiesforyo...le_Manual1.PDF

Name:  e82 rear hubs vs e90 hubs.jpg
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This diagram essentially shows that 1 series e82 coupe, not the e81/e87 hatchback, has a 20mm wider rear track than a e9x 3 series car and e87 hatchback. The result is a rear rotor that adds height to the hat in order to cover the wider rear hub and reduces wheel fitment.
I believe BMW did this probably to make the coupe handle better than e87 when using the same style wheels across the 1 series, thus making the e87 wheels work on the e82 better with wider track, as if they had a 10 mm spacer on each side.
So, my question to you is to verify my logic of the following statement:
If one swaps to e9x rear hubs & new brake rotors, that one can run wheels with lower offsets like et35-40 without fender work, like 17x8.5 from APEX .
I believe the answer is YES. So let me show you why it works with part numbers.


Before writing this up I compared visually my car (I have135i rear rotors) to a 335i. The 335i rotor vs 135i rotor has about 10mm less height in the rotor hat. This confirms the rear track difference.
(So TL; DR - It works, you get 10 mm each side)

So let's start

Part numbers first for e8x and e9x:
Wide Hubs
135i/123d e82 Hub - 33416771082
128i/125i Hub (smaller hand brake shoes & wheel bearing) - 33416771081

Narrow Hubs
130i/335i/330i/328xi Hub - 33416760058
328i/325i/323i/120i Hub (smaller hand brake shoes & wheel bearing) -33416760056

Therefore swapping to narrow hubs, gives us 10mm each side of room.
The nice thing about hubs is that you can find them used, or from numerous OEM's if you search by BMW part number. At most its about $100/side, but I have seen some as low as $50/side from FEBI brand. ( NOTE: If you are a 128i/125i/other 1seires with 135i rear calipers & no hand brake, you should swap to the small handbrake hubs because of rear wheel bearing size.)

This also explains why the 130i needs to swap the hub to run the 135i rear brakes & rotors. Because the 130i/335i hub is too narrow/short for the rear 135i rotor with the tall hat.

We now need to find appropriate rotors to work with our calipers. Here is where I discovered that the 128i/125i has the advantage over the 135i (Finally LOL).
I will start with the 128i/125i and similar e82 coupes:
128i/125i Rear rotor 300x20 - 34216855005
128i/125i/130i/123d/120i/328i/325i & xi/323i Rear Calipers -34216768697 & 34216768698
128i/125i/130i/123d/120i/328i/325 & xi/323i Rear Caliper Carrier - 34216768696

Therefore, these rear rotors will fit, given that they use the same caliper & carrier
328i/325i/323i/120i Rear Rotor 300x20 - 34216764651 / 34216855007

(NOTE: For the adventurous 125i/128i owner with 335i front brakes, this also mean you can run 335i rear Calipers/ carriers & rotors !!!! You just need to swap to a narrow hub and modify the small handbrake brake shoes. See e90 forums about 328i's running 335i rear brakes)

Finding Rotors for the 135i:
135i Rear rotor 324x22 - 34216855003 or the older 34216778649
The problem is that there are no 324x22 rotors with the smaller/ shorter hat.

EDIT: There are 324x22 rotors for e9x hubs!!
http://www.e90post.com/forums/showth...ht=34216795755
130i, e91 & e9x xi Performance rears 324x24 - 34216795755


EDIT 2015:
New rotor discovered for narrow hubs in 324x22, same size as OEM 135i !!!
Along side the e91 Perf rotor 34216795755 there is/was a Blank face rotor for 130i !!

Its part number is 34216787931 , and it gets better because ZIMMERMAN made a copy as part # Zimmermann 150.3477.20


More alternate part numbers for this
http://www.findpart.org/part/bmw-34216787931/


My Guess is that it costs under $150 USD which is the current ECS cost of the e91 euro Performance slotted & dimpled rotor. Interestingly, perhaps because of exchange rates, the e91 rotors cost about $50 less today then they did when I made this article.


Alternative rotor information:
Fortunately, an e90post user did something great. He made 135i calipers work on a 335i ( Same hand brake diameter & Knuckle) using alternate rotors
http://www.e90post.com/forums/showth...ht=135i+brakes
He used washers as spacers to mount caliper and a F10 5 series rear rotor
F10 Rear Rotor 330x20 - 34216775287
The washers are what i believe at least 1.5mm wide or most likely the USA SAE spec 0.065 inches wide (1.65mm)
The F10 rear rotor's hat's back side edge hits the dust shield, so you can cut the shield, remove the sheild or grind off the hat like the e90Post user myE70 did.

Alternitively a e46 330i rear rotors might also fit if they line up with Caliper. It already uses the same diameter handbrake brake shoes, the part numbers are the same as 135i brake shoes.
But its size is 320x22 vs 135i's 324x22 and i don't know how well the rotor goes over the hub, and how the rotor lines up with the caliper.
e46 330i rear 320x 22 Blank -34216855157 / 34216864052
e46 330i rear 320x 22 Cross Drilled Performance rotor- 34212282873
The cross drilled would look great with the DieselBoost carriers/ CSL disks

Maybe even the Z4 forum has insight - one person used x3 rotor machined to fit ( I will edit this if I find solution - EDITED - See above): http://www.zpost.com/forums/showthread.php?t=442217 && http://www.zpost.com/forums/showthread.php?t=751080
Maybe even e83 rear rotor 320x22 34213332217
OR z4 e89 rears 324x20 - 34216782607
OR e60 rears 320x20 - 34216772085

OR M3 e46 rears 328x20 - 34212229379 or CSL rears 328x20 282303304 - ECS / 34212282303 / 34212282304 or e39 euro floating 328x20 - 34212228801/34212228802
(NOTE: this would require a spacer like myE70 did to his caliper to make it work, handbrake spread adjustment may be needed too e46 m3 rotors are 183 mm hand brake vs 185 mm of 135i)

Another approach would be to use RacingBrace RB and have them use a rear rotor hat from 335i and the rotor disk from 135i for a two piece solution


Overall RESULT:
You can now enjoy 10 mm per side of extra room allowing you to fit 17x8.5 et 40 wheels from APEX or Dforce LTW with little or no fender work.
Or Other 17's 8.5's with ~et30 offsets would mean that the same pull/roll is needed as in the past would be used to fit et40 .
This also means that certain e9x rear wheels, and after market concave wheels can fit.

But note, we did change the rear track width at the hub to be the same as e9x. So if you care and wish to regain the difference, you must use appropriate wheel offsets. Therefore, If you used to run et52 OEM 18x8.5 rear, you now must run et 42 18x8.5 to keep the OEM Track width or use a 10 mm spacer. Overall, fitting aggressive wheels in et 40 or similar offset would compensate for this track change.

Keep in mind this would compromise Apex 18' rear 1 series specific fitment, it would need 10mm spacers to fit like it used to.

This hub mod now will allow e82 to use more rear wheel options - possibly some e9x wheels, especially the lower offset wheels, which will not change the Track width ( the offsets compensate). So say hello to more track wheel options and more Concave rear wheels.

Any feedback is welcome, especially about concerns about track width. I am not knowledgeable enough to know issues this causes on the track or certain wheel fitments.
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128i Sport 6MT converted to Euro 130i spec, 3.73 diff, tuned by evolve ~220 whp 207 wtq(ft-lb) SAE
In-progress: //M front arm, M3 rack, e36M lip Wishlist: Coils, n55 mnts, headers, LSD, e60 finn diff


"The 1-series is the last car that BMW engineered before the Germans, as a car-making culture, fell out of love with driving." - R&T 2013 135is

Last edited by andrey_gta; 04-21-2015 at 09:03 PM. Reason: New information
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      04-22-2014, 07:58 PM   #2
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Outstanding research and work, thank you very much for your efforts! I'm surprised HPA, etc didn't come up with this solution for us a long time ago. For sure I need it. I'm running max rear camber, rolled and pulled to the point of minor cosmetic damage, and I still rub. I'll get to work on this mod soon! It will be nice to be able to carry passengers again..lol.
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      04-22-2014, 08:02 PM   #3
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Very interesting. Great research and write-up.

Unfortunately, this is illegal to do within modifications for SCCA Solo (STX) but boy would I do this in a heartbeat. lol
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      04-22-2014, 08:25 PM   #4
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Quote:
Originally Posted by Kgolf31 View Post
Very interesting. Great research and write-up.

Unfortunately, this is illegal to do within modifications for SCCA Solo (STX) but boy would I do this in a heartbeat. lol
What a Bummer...
Its such a negligible mod for a 128i

Quote:
Originally Posted by Eyeman View Post
Outstanding research and work, thank you very much for your efforts! I'm surprised HPA, etc didn't come up with this solution for us a long time ago. For sure I need it. I'm running max rear camber, rolled and pulled to the point of minor cosmetic damage, and I still rub. I'll get to work on this mod soon! It will be nice to be able to carry passengers again..lol.
A solution for 135i calipers may happen soon. Im talking to @e90pilot he has a lot more insight

HPA & others would not publish this mod for moral/ethical reasons if this is illigal for race classes. Therefore no one is to blame
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128i Sport 6MT converted to Euro 130i spec, 3.73 diff, tuned by evolve ~220 whp 207 wtq(ft-lb) SAE
In-progress: //M front arm, M3 rack, e36M lip Wishlist: Coils, n55 mnts, headers, LSD, e60 finn diff


"The 1-series is the last car that BMW engineered before the Germans, as a car-making culture, fell out of love with driving." - R&T 2013 135is

Last edited by andrey_gta; 04-22-2014 at 08:31 PM.
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      04-22-2014, 11:00 PM   #5
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awesome info. bump for more trial on this......someone do it!!
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      04-23-2014, 01:16 AM   #6
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Excellent post and awesome research. Subbed to see where this goes!!
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      04-23-2014, 03:48 AM   #7
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wow that was deep dig
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      04-23-2014, 03:59 AM   #8
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I think @curare86 did this or something similar as well.
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      04-23-2014, 10:36 AM   #9
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Great post. Subscribed!
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      04-23-2014, 11:02 AM   #10
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2008 BMW 128i  [0.00]
324x22 e9x rotors found!

Thanks to @e90pilot and the e9x xi guys like @ObiwanChen
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128i Sport 6MT converted to Euro 130i spec, 3.73 diff, tuned by evolve ~220 whp 207 wtq(ft-lb) SAE
In-progress: //M front arm, M3 rack, e36M lip Wishlist: Coils, n55 mnts, headers, LSD, e60 finn diff


"The 1-series is the last car that BMW engineered before the Germans, as a car-making culture, fell out of love with driving." - R&T 2013 135is

Last edited by andrey_gta; 04-23-2014 at 11:10 AM.
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      04-23-2014, 02:06 PM   #11
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Great job finding this info out!
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      04-23-2014, 02:16 PM   #12
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Tell us MOAR!!
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      04-23-2014, 02:36 PM   #13
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Quote:
Originally Posted by EOD23 View Post
Tell us MOAR!!
I think I did all I could It's all OEM and Plug & play.

The major issue will be the procedure to swap the hubs, because it may force you to buy a new wheel bearing. Youtube Video's of Hub & rear bearing repair show that parts of the bearing will at times stay on the hub. If that is the case and its not some easily replaceable gasket/spacer than this mod becomes more expensive.

I think @flinchy did a hub swap on his 130i, hope he sees this tag.
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128i Sport 6MT converted to Euro 130i spec, 3.73 diff, tuned by evolve ~220 whp 207 wtq(ft-lb) SAE
In-progress: //M front arm, M3 rack, e36M lip Wishlist: Coils, n55 mnts, headers, LSD, e60 finn diff


"The 1-series is the last car that BMW engineered before the Germans, as a car-making culture, fell out of love with driving." - R&T 2013 135is

Last edited by andrey_gta; 04-23-2014 at 02:53 PM.
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      04-23-2014, 02:55 PM   #14
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Sorry, didn't see your post about the rotors. This definitely has potential. Thanks!
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      04-24-2014, 10:03 AM   #15
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WOW, that is really great info. Good job to everyone!
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      04-29-2014, 02:12 PM   #16
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Quote:
Originally Posted by Nugget View Post
I think @curare86 did this or something similar as well.
Yes he did, good memory:
http://www.1addicts.com/forums/showp...4&postcount=31

He used 130i narrow hubs, and a shallower hat( probably e87/e9x spec) for the BBK.

That confirms the theory )
Hopefully now people will have use of the part lists above to save fenders, fit track wheels or eye catching wheels (looking at guys like @1013mm)
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128i Sport 6MT converted to Euro 130i spec, 3.73 diff, tuned by evolve ~220 whp 207 wtq(ft-lb) SAE
In-progress: //M front arm, M3 rack, e36M lip Wishlist: Coils, n55 mnts, headers, LSD, e60 finn diff


"The 1-series is the last car that BMW engineered before the Germans, as a car-making culture, fell out of love with driving." - R&T 2013 135is
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      04-29-2014, 02:19 PM   #17
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Subscribed! If this is fairly easy to swap this would be a great mod to allow us to run a more wide variety of wheel setups in the rear! Pretty stoked!
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      04-29-2014, 03:16 PM   #18
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Holy smokes, awesome research and great info! Those extra mm on each side would REALY open up the floodgates to our existing wheel options today! I am patiently waiting a "DYI" to come up on here soon and see the results.

Great share OP
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      04-29-2014, 05:33 PM   #19
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This is great research. I wish we had a solution for the fronts!
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      04-29-2014, 05:35 PM   #20
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Quote:
Originally Posted by dkay View Post
This is great research. I wish we had a solution for the fronts!
ER WideBody kit
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      05-08-2014, 04:45 PM   #21
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Anyone actually tried this out yet or planning to do it? I'm surprised not more people are interested in this.
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      05-12-2014, 11:01 PM   #22
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Update:
Spoke to my indie mech, he said that the Hub/Spindle usually is replaced along side with the bearings. So there are no shortcuts, you need rear bearings too.
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128i Sport 6MT converted to Euro 130i spec, 3.73 diff, tuned by evolve ~220 whp 207 wtq(ft-lb) SAE
In-progress: //M front arm, M3 rack, e36M lip Wishlist: Coils, n55 mnts, headers, LSD, e60 finn diff


"The 1-series is the last car that BMW engineered before the Germans, as a car-making culture, fell out of love with driving." - R&T 2013 135is
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