Acceptable wheel offset?

/////M3 · 07-06-2009, 08:30 PM

I am considering an upgrade on my mercedes (I also own a BMW, but their forums suck!) wheels/tires----going from 17" to 18". The front wheels currently are 7.5" with ET 45 and the rear wheels are 8.5" with ET 49. The set of wheels I am considering are 8.5", ET 38 (front) and 9", ET 39 on the rear. I put these numbers in an offset calculator and here are the changes:

front: inner clearance=6mm less, outer position=extend 20mm
rear: inner clearance=4mm more, outer position=extend 16mm

Are these changes in offset and wheel position substantial enough to cause any undue wear on the car or worsen ride quality?

persian54 · 07-06-2009, 08:34 PM

lol this is a bmw forum..

umzzy · 07-06-2009, 09:17 PM

ak335 · 07-06-2009, 09:23 PM

LOOOOLLLL

325/528 · 07-06-2009, 09:25 PM

I'd look at the wheel specifications on tirerack.com and see what offsets they find acceptable for your make and model.

askiles · 07-06-2009, 10:28 PM

I have no clue what these are going on, but extending 20mm out is quite a bit for any vehicle.

-Andy

King Tut · 07-07-2009, 06:46 PM

I think you will be fine. 20mm isn't that much. The best thing to do is find other exact models of your car, you know on a Mercedes site, that have similar offsets to what you want to use to see if they will rub.

askiles · 07-07-2009, 08:52 PM

Quote:

Originally Posted by King Tut

I think you will be fine. 20mm isn't that much. The best thing to do is find other exact models of your car, you know on a Mercedes site, that have similar offsets to what you want to use to see if they will rub.

20mm is not much based on what? It all depends on what car it is going on. If it was flush to begin with, 20mm is A LOT.

-Andy

duk · 07-07-2009, 10:59 PM

what is this crap?

Johan@WSTO · 07-08-2009, 05:31 PM

Offset/width of a wheel will not affect ride quality or wear on the car. It will only affect whether you will rub on the fenders/suspension of the car.

Let us know what type of Mercedes you have and we can help you out some more.

We are a sponsor of mymbonline.com and should be able to help you out with your wheel selection. Shoot me a PM if you would like.

07-06-2009, 08:30 PM	#1
/////M3 New Member 4 Rep 8 Posts Drives: 2008 M3 Join Date: May 2009 Location: NC iTrader: (0)	Acceptable wheel offset? I am considering an upgrade on my mercedes (I also own a BMW, but their forums suck!) wheels/tires----going from 17" to 18". The front wheels currently are 7.5" with ET 45 and the rear wheels are 8.5" with ET 49. The set of wheels I am considering are 8.5", ET 38 (front) and 9", ET 39 on the rear. I put these numbers in an offset calculator and here are the changes: front: inner clearance=6mm less, outer position=extend 20mm rear: inner clearance=4mm more, outer position=extend 16mm Are these changes in offset and wheel position substantial enough to cause any undue wear on the car or worsen ride quality?
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07-06-2009, 08:34 PM	#2
persian54 Lieutenant General 922 Rep 15,818 Posts Drives: M760/G83M4 Join Date: Jun 2009 Location: The Valley, SoCal iTrader: (298)	lol this is a bmw forum..
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07-06-2009, 09:17 PM	#3
umzzy Lieutenant 87 Rep 595 Posts Drives: 2024 X5 Join Date: May 2009 Location: NJ iTrader: (10) Garage List 2009 BMW 335i [10.00]
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07-06-2009, 09:23 PM	#4
ak335 Lieutenant Colonel 117 Rep 1,564 Posts Drives: Cayman S Join Date: Jun 2008 Location: Northern Va iTrader: (3)	LOOOOLLLL
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07-06-2009, 09:25 PM	#5
325/528 Second Lieutenant 23 Rep 278 Posts Drives: pinto Join Date: Jan 2008 Location: lost soul iTrader: (7)	I'd look at the wheel specifications on tirerack.com and see what offsets they find acceptable for your make and model.
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07-06-2009, 10:28 PM	#6
askiles Major 56 Rep 1,164 Posts Drives: 2008 M3 Sedan - Alpine White Join Date: Apr 2009 Location: Phoenix, AZ iTrader: (2)	I have no clue what these are going on, but extending 20mm out is quite a bit for any vehicle. -Andy __________________ 2008 M3 Sedan- Alpine White
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07-07-2009, 06:46 PM	#7
King Tut NASA SpecE30 Racer 82 Rep 1,307 Posts Drives: 2006 Honda S2000 TT3 Join Date: Jul 2008 Location: Gulf Breeze, FL iTrader: (2)	I think you will be fine. 20mm isn't that much. The best thing to do is find other exact models of your car, you know on a Mercedes site, that have similar offsets to what you want to use to see if they will rub. __________________ King Tut 2012 BMW M3 Individual: Sold lsb.ridedomain.com 1987 BMW 325is SpecE30: spece30.ridedomain.com 2009 BMW M3 Coupe: Sold e92.ridedomain.com
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07-07-2009, 10:59 PM	#9
duk ///M 158 Rep 3,195 Posts Drives: 2011 AW/FR 6MT E92 Join Date: Jun 2007 Location: Irvine, CA iTrader: (0)	what is this crap? __________________ 2011.5 AW/FR E92 M3 6MT
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07-08-2009, 05:31 PM	#10
Johan@WSTO Colonel 200 Rep 2,117 Posts Drives: BMW E89 Z4 Join Date: Mar 2008 Location: Chicago iTrader: (2)	Offset/width of a wheel will not affect ride quality or wear on the car. It will only affect whether you will rub on the fenders/suspension of the car. Let us know what type of Mercedes you have and we can help you out some more. We are a sponsor of mymbonline.com and should be able to help you out with your wheel selection. Shoot me a PM if you would like. __________________
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