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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 > Front/Rear wheel spacer suggestion: Square 8.5'' 235/40/18



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      04-11-2015, 12:34 AM   #1
left123
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2006 bmw 330i  [5.00]
Front/Rear wheel spacer suggestion: Square 8.5'' 235/40/18

Evening,

On my e90 330i zsp, I have four 8.5'' bmw style 162 wheels with a squared 235/40/18 tire size, for rotating purposes, (michelin pilot a/s 3) and am considering getting (rear) spacers. I am not interested in gaudy stretching in the back, but just want it to look better than it does stock, all tucked under and such. Here are the facts:

Suspension: BMW Performance suspension (slight drop)

Rear wheel + tire: 8.5'', 235/40/18
Front wheel + tire: 8.5'', 235/40/18

Here are my questions:

1. What size rear spacer do I need considering the smaller tire size than the normal (I previously had the 255/35/18 from the stock size)?

2. Should I consider a front wheel spacer?

3. (EDIT: YES I DO) Do I need longer lug nuts to accompany these spacers (ie, when are longer lug nuts necessary)?

Thanks and please let me know.
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2006 e90 330i || TiAg || OEM 162's || 6MT ||BMW Performance Suspension V2 || zHP shifter || redline oils || BMWCCA Member #474774
DIY Service Completed:Engine Coolant Flush+Battery Replacement (no registration!)+Rear Differential Fluid +Manual Transmission Fluid+Engine Oil Change+Front Control Arm/Tension Strut upgrade (my DIY Guide)+Power Steering Flush+Faulty Ignition Coil Replacement

Last edited by left123; 04-12-2015 at 09:09 PM.
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      04-12-2015, 06:28 PM   #2
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As a reply to my own thread, I measured the tire to inner fender distance on my rears and I got between 5/8'' and 3/4'' (~16-19 mm). That measurement is to the inner material of the fender, not the metal exterior portion.

Because I have narrower tires on the rear than stock (235 vs 255), I want to say that I have MORE clearance than normal (seems fairly obvious I would say). I just want to see what other people have done with the narrower rear tire as this is not a typical size that people talk about on here.

Any thoughts?

I am leaning towards 15mm spacers for the rear only.
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      04-12-2015, 09:05 PM   #3
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Here is a video:

http://www.ecstuning.com/Search/Site...6/Video219-HD/
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      04-12-2015, 09:07 PM   #4
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Quote:
Originally Posted by HP_HOUND View Post
Yeah, I recently watched that and then measured my wheels myself.

I am more really interested in people who have used a square setup and what spacers they were running. I am using the wider 8.5'' wheel all around which is not typical on here. Just curious before I plunk down $100ish on some spacers/studs.
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      04-13-2015, 08:57 AM   #5
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You should be able to fit a 12mm out back no problem. I would go with a 15mm though as that should fit without rubbing as well. Just rent all four sizes to see which will work best in your case; that way you can try the 10mm up front and see how that looks as well:
http://www.rogueengineering.com/rogue/WH/WSPACER.html

How much camber do you have in the rear currently?
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Summer: Sonic Tuning ST100 - 18x8.5 ET35 - Conti DWS 245/40/18 - 10/15 F/R spacers
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      04-13-2015, 09:05 AM   #6
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Quote:
Originally Posted by FCobra94 View Post
You should be able to fit a 12mm out back no problem. I would go with a 15mm though as that should fit without rubbing as well. Just rent all four sizes to see which will work best in your case:
http://www.rogueengineering.com/rogue/WH/WSPACER.html

How much camber do you have in the rear currently?
I have not changed any camber in the rear other than from the drop with BMW PS (which is not dramatic. Probably less than 1'').

In the front I pulled the pins to get whatever additional camber that adds. That is probably the extent to which I will adjust camber as I am not interested in camber plates (other than potentially the fixed Dinan ones for cost/sound/maintenance/resale).

I was not aware of the rental option via Rogue Engineering and will consider that. I wish they would add the rental fee minus shipping to the purchase of the eventual spacers, but beggars can't be choosers I suppose.

Thanks for the reply.
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DIY Service Completed:Engine Coolant Flush+Battery Replacement (no registration!)+Rear Differential Fluid +Manual Transmission Fluid+Engine Oil Change+Front Control Arm/Tension Strut upgrade (my DIY Guide)+Power Steering Flush+Faulty Ignition Coil Replacement
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      04-13-2015, 09:22 AM   #7
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Miles on car? When your front control arms start to wear out, look into the M3 units for a bit more camber as well.
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Summer: Sonic Tuning ST100 - 18x8.5 ET35 - Conti DWS 245/40/18 - 10/15 F/R spacers
Winter: Style 159 - 17x8 ET34 - Michelin X-Ice Xi2 225/50/17 - 10/15 F/R spacers
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      04-13-2015, 10:57 AM   #8
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Quote:
Originally Posted by FCobra94 View Post
Miles on car? When your front control arms start to wear out, look into the M3 units for a bit more camber as well.
62k miles. I have already replaced the front control arms with upgraded HD versions (unfortunately not the M3 versions which I should have done). I actually only changed the lower ones, which dont change camber. I could still do the upper ones but probably wont go that route b/c of lack of time/resources at this point.
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