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Tire Rack's Tires, Wheels, Brakes & Suspension
Discuss everything about wheels, tires, suspension and brakes for your BMW.

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  #1  
Old 10-12-2012, 11:54 PM
dnadrifter dnadrifter is offline
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Location: SF Bay Area
 
Join Date: Jul 2012
Posts: 63
Mein Auto: 2004 M3
Help understanding offsets / outside tire location

Hi All,

I am a big newbie when it comes to understanding offsets etc.

I would like to be able to estimate how much more or less a tire would stick out given wheel width, offset, tire section width, etc.

For example:

On my X5, I have Y spoke 214 wheels that in front are 20 x 10 ET40 running stock 275/40. In back they are 20 x 11 ET 37 running 315/35.

If I was to run a square set up without spacers and put the 20x10 ET40 with 275/40 on the back, how many cm/mm of difference would I see relative to where the outside edge of the tire was with the 20x11 ET 37.

I would like to understand how to calculate this so I can do it for other configurations. I assume this is also how one calculates which size spacers one might want to use.

Can someone point to a good tutorial, web app/calculator etc.?

Many thanks.
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2004 M3, Silver Gray / Blk, 6MT
2013 X5, 35i Sport Activity, Platinum Gray / Blk, AD
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  #2  
Old 10-13-2012, 03:37 PM
djsaad1 djsaad1 is offline
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Location: austin
 
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http://www.rimsntires.com/specs.jsp
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  #3  
Old 10-16-2012, 02:33 PM
dnadrifter dnadrifter is offline
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Location: SF Bay Area
 
Join Date: Jul 2012
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Mein Auto: 2004 M3
Quote:
Originally Posted by djsaad1 View Post
Thanks for posting.

Unless I am not understanding it though, it doesn't give me the difference in the where the front face of the wheel/tire is going to be. It only tells me if the wheel will clear in back. It looks like there paid version may help, but I don't really want to pay for a wheel app.

Anyway else have an internet tool they use?
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2004 M3, Silver Gray / Blk, 6MT
2013 X5, 35i Sport Activity, Platinum Gray / Blk, AD
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  #4  
Old 10-18-2012, 09:37 AM
djsaad1 djsaad1 is offline
Officially Welcomed to the 'Fest
Location: austin
 
Join Date: Sep 2012
Posts: 700
Mein Auto: range rover
Quote:
Originally Posted by dnadrifter View Post
Thanks for posting.

Unless I am not understanding it though, it doesn't give me the difference in the where the front face of the wheel/tire is going to be. It only tells me if the wheel will clear in back. It looks like there paid version may help, but I don't really want to pay for a wheel app.

Anyway else have an internet tool they use?
The bottom part shows you how far away or how close the tire will be to the suspension and/or fender.
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