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      08-15-2011, 09:18 AM   #1
dpw198
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Wheel offset questions

Hello,

I do not understand how to determine the correct wheel offset when choosing winter wheels for my 335xi with m-sport package.

My OEM set up is:
F - 225/40/18, 18x8 wheel, 34mm offset
R 235/40/18, 18x8.5 wheel, 37mm offset

Now, if I go down to a 17 wheel , what would be the minimum and maximum offset required if I am going to run 225/45/17 on all four corners?

The Tirerack configurator pulls up 17x7.5 wheels with offsets that are +32mm, 34mm and 35mm and 17x8/17x8.5 wheels with offsets of +40mm.

Am I ok if I stick with any of the Tirerack wheel sizes and offset combos?

I have also read that OEM wheels off a non-xDrive may not fit the XDrive models. Any truth to this?

Can anyone offer any advice or anything else I should watch out for?

Thanks
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      08-15-2011, 10:49 AM   #2
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Quote:
Originally Posted by dpw198 View Post
Hello,

I do not understand how to determine the correct wheel offset when choosing winter wheels for my 335xi with m-sport package.

My OEM set up is:
F - 225/40/18, 18x8 wheel, 34mm offset
R – 235/40/18, 18x8.5 wheel, 37mm offset

Now, if I go down to a 17” wheel , what would be the minimum and maximum offset required if I am going to run 225/45/17 on all four corners?

Offsets can stay the same as your original set up. Offsets do not change with the diameter/width of a wheel. Although it can play a role in how your tires fit(only if you go with extreme fitments, not applicable in this case). It's just how close to the fender your wheels will be.


The Tirerack configurator pulls up 17x7.5 wheels with offsets that are +32mm, 34mm and 35mm and 17x8/17x8.5 wheels with offsets of +40mm.

Am I ok if I stick with any of the Tirerack wheel sizes and offset combos?

Tirerack suggested sizes should be fine. Please keep in mind, often OEM configuration are very conservative and you could add quite a bit more to have a more "flushed" look, if you prefer.

I have also read that OEM wheels off a non-xDrive may not fit the XDrive models. Any truth to this?

To a certain extent. This is because non-Xdrive cars often run a staggered set up(rear wider than fronts). This is supposed to mess with the xdrive system. HOWEVER, with a proper tire set up this is possible.

Can anyone offer any advice or anything else I should watch out for?

Thanks
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      08-15-2011, 03:43 PM   #3
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If you get a 7.5" wheel, you want the option with the lowest offset... in your example it would be the 32 although I'm not sure how much you will like the look of it.

Try and find an 8" wheel with something in the 25-30 offset range, I've seen a couple on tirerack.
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      08-15-2011, 05:34 PM   #4
dpw198
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Thanks for the feedback but I'm a little confused.

If I go with a 7.5 wheel, would I not want it to be a higher offset like a 40 as opposed to a 32? Similarly on an 8 wheel, would I not want a higher offset?

I thought with a narrower wheel, I would want a higher positive offset so it would "push" the rim outward, closer to the fender to balance the look.

Did I get the concept in reverse?
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      08-16-2011, 10:48 AM   #5
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Dr. G,

Now I understand what you said in your post.

I found the following which was really helpful to do the wheel size / offset conversions.

http://www.1010tires.com/wheeloffsetcalculator.asp
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