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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 > Wheel offset



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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.
 
TIRE WIDTH
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ASPECT RATIO
- WHEEL DIAMETER
ORIGINAL TIRES
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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.)
      New Tires Diameter (in.)
  Difference in diameter (in.)
           Percent Difference %
                     
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      03-11-2007, 02:58 PM   #1
nicks3
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Wheel offset

Can anyone explain this to me?

If you had two identical wheels but one was offset say 20 and the other 40 how would they compare looks wise, which would have the deeper dish kerbside?
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      03-11-2007, 03:08 PM   #2
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Quote:
Originally Posted by nicks3 View Post
Can anyone explain this to me?

If you had two identical wheels but one was offset say 20 and the other 40 how would they compare looks wise, which would have the deeper dish kerbside?
The one with offset 20 will stick 20 mm more out from the car than the other one
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      03-11-2007, 03:11 PM   #3
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The one with the offset 40 will stick 20 mm more in from the fender than the other one
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      03-11-2007, 03:12 PM   #4
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offset

So how do those measurements work as I would have thought that the 40 would stick out 40mm from the centreline of the wheels and the 20 would stick out 20mm from the centreline?
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      03-11-2007, 03:25 PM   #5
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Quote:
Originally Posted by nicks3 View Post
So how do those measurements work as I would have thought that the 40 would stick out 40mm from the centreline of the wheels and the 20 would stick out 20mm from the centreline?
Offset 40 means 40mm from the centerline of the wheel to the hub surface.

http://www.tirerack.com/wheels/tech/...jsp?techid=101
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      03-11-2007, 03:47 PM   #6
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offset

Quote: Offset 40 means 40mm from the centerline of the wheel to the hub surface.
So Offset 20 means 20mm from the centerline of the wheel to the hub surface which mean that the 20mm will have a deeper dish looking from the outside of the wheel (side of the car)?
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      03-11-2007, 04:58 PM   #7
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Quote:
Originally Posted by nicks3 View Post
Quote: Offset 40 means 40mm from the centerline of the wheel to the hub surface.
So Offset 20 means 20mm from the centerline of the wheel to the hub surface which mean that the 20mm will have a deeper dish looking from the outside of the wheel (side of the car)?
Correct.
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      03-11-2007, 05:06 PM   #8
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offset

Ok got it now, thanks!
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      03-11-2007, 09:02 PM   #9
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So since I currently have an 8.5 in wheel that is 40 offset, if I move to a 9.5 in wheel that is 45 offset, will the wheel sit out and extra 20.4mm? 1"=25.4mm, so 25.4mm-5mm for the offset increase = 20.4mm? Or do I need to divide that by 2 since its from the wheel centerline, and if so the wheel would only sit about 10mm out more?
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      03-12-2007, 01:12 PM   #10
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Quote:
Originally Posted by Fraggy View Post
So since I currently have an 8.5 in wheel that is 40 offset, if I move to a 9.5 in wheel that is 45 offset, will the wheel sit out and extra 20.4mm? 1"=25.4mm, so 25.4mm-5mm for the offset increase = 20.4mm? Or do I need to divide that by 2 since its from the wheel centerline, and if so the wheel would only sit about 10mm out more?
You need to divide by 2, so it will be 25.4/2=12.7 and 12.7-5=7.7mm more out
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      03-12-2007, 04:37 PM   #11
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The greater the offset ie 34 vs. 40 the further out or in the wheel will sit on the car. 34 sticks out further then 40 and vis versa
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      03-12-2007, 09:23 PM   #12
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offset is very important when choosing a wheel....lol
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      03-12-2007, 09:59 PM   #13
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Quote:
Originally Posted by remmib View Post
You need to divide by 2, so it will be 25.4/2=12.7 and 12.7-5=7.7mm more out
Thanks man, I was always horrible at math
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