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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 > 18" Forgestar setup E92 pre-LCI M-sport



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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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- 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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      02-13-2013, 04:34 PM   #1
E92mech
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Drives: 2010 E92 Le Mans M-Sport
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18" Forgestar setup E92 pre-LCI M-sport

I've been searching through many posts; this subforum is very information rich. Unfortunately, I haven't found a concise answer to my admittedly straightforward question.

I drive a 2010 E92 M-sport pre-LCI. I currently have OEM 19" type 225 wheels with Michelin Pilot Super Sports. Specifically, they are:

Type 225
Front: 8x19 ET 37 Tire: 225/35/19
Rear: 9x19 ET 39 Tire: 255/30/19

I'm thinking about switching to Forgestar wheels, particularly 18" wheels, and would be mounting Michelin PSS either way.

What are the maximum front/back wheel/tire sizes that I could use in either 19" or 18" on this car without readjusting fenders, suspension or camber?

Much appreciated.
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      02-13-2013, 05:24 PM   #2
deluxe 247
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depends on offset and width, but generally i believe 235/35 front 265/30 with 19s 235/40 265/35 with 18s
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      02-13-2013, 05:57 PM   #3
E92mech
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Great, thanks--

With those increased dimensions on the tire width/aspect, can I increase my wheel size front/back by 0.5" each from OEM 8"/9" front:back to 8.5"/9.5" front:back without causing rubbing? For example, when I use the calculator, with same offsets, a 9.5 rear wheel would extend 6mm extra inside and outside, while the overall dimension falls within 1%.

Thanks again
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