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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 > Offset vs lip size



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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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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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      06-30-2008, 05:00 PM   #1
kknt335
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Offset vs lip size

Guys.

Would I be correct to assume that the lower the offset for a given wheel width, the larger the outer lip?

Looking at the picture at: http://www.tirerack.com/wheels/tech/...jsp?techid=101 it would look that way but is there another piece of the equation I am missing?

Also if one were to order fronts wheels with a BBK in mind, (I'm not planning to) would the offset value go up or down?

My goal is to get a big lip w/o having to do major camber adjustments. Rolled fenders is something I have already planned for.
Manufacturer is recommending ET35 all around but I think those numbers are on the conservative side.

If anyone cares, here's the setup I am eyeing:

E92 with Rolled Fenders, coilovers,
F 20x8.5 ET35, (should/can I go lower than this "conservative" number)
R 20x10 ET30,
Falken 452s 245/30 285/25


thanks in advance
-d
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      06-30-2008, 05:21 PM   #2
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i dont think it would matter about the lip
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      06-30-2008, 05:49 PM   #3
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Ok so really you are asking quite a lot. Offset generally plays no part in the lip equation especially for most one pice wheels.

By looking at the drawing from Tire Rack that is a common misconception with one piece wheels. The lip is really created by the actual design of the spoke. On most one piece wheels to change the offset they will machine the backpad which will create no change on the lip.

Also as for the BBK set up sometimes changing the offset can allow for the clearance of the brake but then you run the chance of pushing the wheel to far out of the fender well. So even in these scenarios spoke design comes into play again. Example WRX STI's for the most part you never really see big lips on these cars because first the stock BBK, and the high offset needed to keep the wheel under the fender.

To answer the set up you are eyeing. The 20x8.5 really needs to be an ET30mm if you are looking to be aggressive. depending on how low you go the rubbing you may have would be on hard compression or pulling into a drive way, but normal driving you shoul be good.

As for the 20x10 I would actually suggest the ET35mm instead of the 30mm because you will rub even with a fender roll, especially if you are lowered since the e92 rear is tighter than the E90. Those are my recommends to avoid major camber adjustments.

Hope it helps a little. One little thing I noticed too, your tire sizing is off those tires are gonna rub, I would go 245/30 & 285/25. Keep in mind my word is not gospel just a recommendation form some experiences.
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      06-30-2008, 06:08 PM   #4
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Quote:
Originally Posted by kknt335 View Post
Guys.

Would I be correct to assume that the lower the offset for a given wheel width, the larger the outer lip?
-d
Yes, in theory for 3 piece wheels assuming the center is the same.
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      06-30-2008, 07:06 PM   #5
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Man so many misconceptions about wheels.

Width and Offset need to be talked about in the same sentence. And the wheel design dictates most "lip" so you really have to look at what wheel you want and if it's designed around a lip.
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      07-01-2008, 03:40 AM   #6
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Thanks for all the replies and recommendations.

I am learning a lot here.

Any additional comments or revelations is most definitely welcome.
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      07-01-2008, 04:35 PM   #7
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Quote:
Originally Posted by kknt335 View Post
Would I be correct to assume that the lower the offset for a given wheel width, the larger the outer lip?
This largely depends on the design of the wheel. For most cast wheels, the offset will not affect the face or lip of the wheel unless multiple castings were produced for different offsets.


Quote:
Originally Posted by kknt335 View Post
Also if one were to order fronts wheels with a BBK in mind, (I'm not planning to) would the offset value go up or down?
BBK clearance, in the most standard case, does change the offset value. It would only change the design of the face to allow for more caliper clearance.


So, if you're looking to maximize lip, you'll want to find a wheel design that offers a relatively flat face. Usually 3 piece wheels are able to accommodate this, however there wheels like our V715, which are one piece, that are also able to to afford some good "lippage" with the slight sacrifice to big brake clearance.


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      07-01-2008, 04:46 PM   #8
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Well for BBK Clearance - its not the offset it has to do with a design, you need to get a wheel designed to clear on the front. That will affect the front wheel's lip size of course.

As to the rear if the offset is lower - as in comparing with different wheel offsets you'll find a deeper lip typically on the rear. However you cant really look at it that way, its not like you can use a smaller offset just to increase your lip size because the wheel will basically not fit your vehicle.

Hope that helps clarify things.
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