Please Help! Questions about BBS RG-R wheel fitment.

andrew777 · 11-10-2009, 02:19 PM

Hey,

I was wondering if the 18x8.5 would fit on the 135i without needing to do any type of suspension mods. I don't see why not, but when it comes to wheels/tires I really don't know what I'm doing. I am also planning on running the goodyear eagle f1 assymetrics I currently have on them. 225 in the front and 255 in the back. Would this setup work? Any rubbing?

Gary@TireRack · 11-10-2009, 02:44 PM

The best offset in the 8.5" is 38. Problematic to the outside, especially on the front with wider tires.

andrew777 · 11-10-2009, 03:08 PM

Quote:

Originally Posted by Gill@Tirerack.com

The best offset in the 8.5" is 38. Problematic to the outside, especially on the front with wider tires.

Would a fender roll solve this or would it require further modification? I am currently running the 225's on the stock rims that are 7.5" without rubbing. I really want to avoid any rubbing if possible.

Gary@TireRack · 11-10-2009, 03:17 PM

The 7.5" is 49 offset. So, you have a wheel that sticks out 11mm (apprx. 1/2") further and is 1" wider. Figure half that on both sides and the RGR would sit 1" further to the outside than what you have now.

Not sure a fender roll will fix that. That's a lot.

andrew777 · 11-10-2009, 03:35 PM

Quote:

Originally Posted by Gill@Tirerack.com

The 7.5" is 49 offset. So, you have a wheel that sticks out 11mm (apprx. 1/2") further and is 1" wider. Figure half that on both sides and the RGR would sit 1" further to the outside than what you have now.

Not sure a fender roll will fix that. That's a lot.

Well, that sucks. I was thinking I had finally found a wheel I really liked that would work well on the car. Guess I will have to keep searching. If I don't find anything soon I will probably just go with the breyton gts-r's, but I was hoping to find a forged wheel.

Feyd · 11-10-2009, 04:52 PM

Quote:

Originally Posted by andrew777

Well, that sucks. I was thinking I had finally found a wheel I really liked that would work well on the car. Guess I will have to keep searching. If I don't find anything soon I will probably just go with the breyton gts-r's, but I was hoping to find a forged wheel.

Welcome to the fray, though there are some new wheels coming on the market soon that have 1er specific offsets.

If you want a "forged wheel" there are plenty of options, but they are expensive. HRE/360 Forged/Iforged, etc, etc....

cannonball · 11-10-2009, 10:07 PM

I´m facing the same dilema, I want the same size wheel fr & rr 18"x8.5" but can´t decide which offset is best

taichi · 11-11-2009, 01:33 AM

I can comment the front that you can put in 8.5 ET40 without rubbing if you are on stock suspension or sports springs, running this setup currently.

arrutled · 11-11-2009, 04:55 AM

yeah not to mention if you add a little camber you can tuck the wheel in further. Alignment pin removal. I have an et38 coming 8.5" and I believe you can run 235's without rubbing.

bankerkys · 11-13-2009, 03:05 PM

Is the ET38 or ET40 the optimal offset? I've been trying to find an answer to the question, but may have missed the answer somewhere on the forum.

andrew777 · 11-14-2009, 10:11 PM

Well I am thinking I might try this anyway. If there is rubbing I will just add some neg camber. Will probably end up costing more than I had planned, but it should improve handling by quite a bit. I think I would be losing 20 lbs of unsprung weight from the lighter wheels alone and adding neg camber will only make the car handle better.

sootyvrs · 11-15-2009, 02:20 AM

I have 8.5" ET43 on the front and no rubbing on arch or the strut.

I believe 8.5" ET38 will need some negative camber (camber plates) and some arch rolling if you plan to lower it.

Here's a pic of a Advan RS 8.5" ET38 on the front of a 135i showing camber required to make them fit

11-10-2009, 02:19 PM	#1
andrew777 Second Lieutenant 37 Rep 263 Posts Drives: 135i alpine white Join Date: May 2009 Location: NJ iTrader: (1)	Please Help! Questions about BBS RG-R wheel fitment. Hey, I was wondering if the 18x8.5 would fit on the 135i without needing to do any type of suspension mods. I don't see why not, but when it comes to wheels/tires I really don't know what I'm doing. I am also planning on running the goodyear eagle f1 assymetrics I currently have on them. 225 in the front and 255 in the back. Would this setup work? Any rubbing?
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11-10-2009, 02:44 PM	#2
Gary@TireRack Moderator 369 Rep 4,745 Posts Drives: Formerly 1995 M3 Join Date: Oct 2006 Location: South Bend, IN, Tire Rack HQ iTrader: (2)	The best offset in the 8.5" is 38. Problematic to the outside, especially on the front with wider tires. __________________ Gary. Tire and Wheel Forum Moderator. Tire Rack Sales Rep Gary@Tirerack.com http://www.tirerack.com/a.jsp?a=AH8&url=index.jsp Please refer to 'Gary/E90 Post' as your previous contact when you order online to help support this forum.
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11-10-2009, 03:17 PM	#4
Gary@TireRack Moderator 369 Rep 4,745 Posts Drives: Formerly 1995 M3 Join Date: Oct 2006 Location: South Bend, IN, Tire Rack HQ iTrader: (2)	The 7.5" is 49 offset. So, you have a wheel that sticks out 11mm (apprx. 1/2") further and is 1" wider. Figure half that on both sides and the RGR would sit 1" further to the outside than what you have now. Not sure a fender roll will fix that. That's a lot. __________________ Gary. Tire and Wheel Forum Moderator. Tire Rack Sales Rep Gary@Tirerack.com http://www.tirerack.com/a.jsp?a=AH8&url=index.jsp Please refer to 'Gary/E90 Post' as your previous contact when you order online to help support this forum.
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11-10-2009, 10:07 PM	#7
cannonball also 66 shelby 350gt, 64 jag e-type, 84 MB 500sl, 5 Rep 31 Posts Drives: DD 135DCT, 05 997 Join Date: Oct 2009 Location: Lima,Peru iTrader: (0)	I´m facing the same dilema, I want the same size wheel fr & rr 18"x8.5" but can´t decide which offset is best
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11-11-2009, 01:33 AM	#8
taichi Captain 52 Rep 937 Posts Drives: F30 & F25 Join Date: Oct 2006 Location: B.C, Canada iTrader: (6) Garage List 2013 BMW 328i xDrive [10.00] 2013 BMW X3 28i [0.00]	I can comment the front that you can put in 8.5 ET40 without rubbing if you are on stock suspension or sports springs, running this setup currently. __________________ some lip, some springs, some brakes, some wheels.
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11-11-2009, 04:55 AM	#9
arrutled Colonel 104 Rep 2,474 Posts Drives: Olsa Join Date: Jun 2008 Location: Western Mass iTrader: (0)	yeah not to mention if you add a little camber you can tuck the wheel in further. Alignment pin removal. I have an et38 coming 8.5" and I believe you can run 235's without rubbing. __________________ AW 135i w/ blackette, performance short shift kit, BMW alarm, Performance rotors, APEX ARC-8 wheels, Direzza Star Spec 235/275, Dinan stage 3 suspension, M3 wishbones/tension rods/front sway/rear subframe bushings and thats all folks!
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11-13-2009, 03:05 PM	#10
bankerkys Private First Class 12 Rep 143 Posts Drives: 2022 BMW M340i Join Date: Oct 2009 Location: Sugar Land, TX iTrader: (1)	Is the ET38 or ET40 the optimal offset? I've been trying to find an answer to the question, but may have missed the answer somewhere on the forum.
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11-14-2009, 10:11 PM	#11
andrew777 Second Lieutenant 37 Rep 263 Posts Drives: 135i alpine white Join Date: May 2009 Location: NJ iTrader: (1)	Well I am thinking I might try this anyway. If there is rubbing I will just add some neg camber. Will probably end up costing more than I had planned, but it should improve handling by quite a bit. I think I would be losing 20 lbs of unsprung weight from the lighter wheels alone and adding neg camber will only make the car handle better.
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11-15-2009, 02:20 AM	#12
sootyvrs Lieutenant 35 Rep 485 Posts Drives: BMW M340d Join Date: Sep 2008 Location: NE UK iTrader: (1)	I have 8.5" ET43 on the front and no rubbing on arch or the strut. I believe 8.5" ET38 will need some negative camber (camber plates) and some arch rolling if you plan to lower it. Here's a pic of a Advan RS 8.5" ET38 on the front of a 135i showing camber required to make them fit __________________ 2018 BMW E87 M2
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