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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 > What Tire Size can I Use ?



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Wheel offset calculator courtesy of BimmerPost.com. You may use this calculator to calculate what tire sizes you might need if you upgrade your tires, or what wheel sizes/offsets are compatible with your car.
    Current Wheel Width  inches             Current Wheel Offset  mm.
         New Wheel Width  inches                  New Wheel Offset  mm.
 
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NEW TIRES
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Based on your stock wheel setup, your new wheel will have:
Original Tires Diameter (in.)
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  Difference in diameter (in.)
           Percent Difference %
                     
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      01-11-2013, 04:24 PM   #1
E36graduate
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What Tire Size can I Use ?

Trying to lower the tire profle on existing rims.....currently have the stance I like, wouldn't mind making my rear tires look a little lower profile.

18x8 on front with 225/40/18
18x8.5 on rear with 265/35/18

I don't mind the fronts as they seem low profile, but what can be done on the rear....I know 255/35/18 are the oem spec, but what would fit on the rear rims to make the side profile smaller.....any ideas?
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      01-11-2013, 07:30 PM   #2
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The profile (second number) is actually a percentage of the width. So if you go with a narrower tire such as a 255 or 245, it'll give you a shorter side wall. If you like the look of low profile tires, look into going up a diameter, 19's or 20's?
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      01-11-2013, 07:53 PM   #3
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Thanks.....so how do i calculate going to 19" from 18" without changing the amount of gap I currently have....meaning I want to swap out my 18" for 19" and not sure what type of rubber I am supposed to get?

example: 18x8 with 225/40/18 going to a 19x?? would use 215/30/19
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      01-11-2013, 08:02 PM   #4
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Well, I would start with the stock sizes and go from there... stock E9x tires would be 225/40-18 front 255/35-18 rear so someone put wider rears on your car before you got it... corresponding 19" size would be 225/35-19 front and 255/30-19. People are also using 235/35-19 and 265/30-19 tires on E9xs without too much problems if you like a little wider look. I'm hesitant to recommend tires with significant rolling diameter differences front-rear even on a RWD car because I don't know how that will mess up the ABS, stability control, etc

If you think about it, if your rolling diameter is close, your sidewalls should look pretty much identical front-rear as well.
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      01-14-2013, 09:24 AM   #5
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Quote:
Originally Posted by N8N View Post
Well, I would start with the stock sizes and go from there... stock E9x tires would be 225/40-18 front 255/35-18 rear so someone put wider rears on your car before you got it... corresponding 19" size would be 225/35-19 front and 255/30-19. People are also using 235/35-19 and 265/30-19 tires on E9xs without too much problems if you like a little wider look. I'm hesitant to recommend tires with significant rolling diameter differences front-rear even on a RWD car because I don't know how that will mess up the ABS, stability control, etc

If you think about it, if your rolling diameter is close, your sidewalls should look pretty much identical front-rear as well.
+1. Good post.


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