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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 > Square Set up



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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.)
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      11-24-2011, 12:47 AM   #1
E90 Freak
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2006 325i  [0.00]
Square Set up

I have a 2006 BMW 325i on St V1 Coliovers.Need your opinions if it will look aggressive and would I need any fender roll required.Give me your opinions/

Front: 18x8.5 et 35 235/45/18
Rear:18x8.5 et 35 245/40/18


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E90 Freak

Last edited by E90 Freak; 11-28-2011 at 09:48 PM.
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      11-28-2011, 01:49 PM   #2
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      11-29-2011, 04:13 AM   #3
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Coupe or sedan?
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      11-29-2011, 12:09 PM   #4
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Quote:
Originally Posted by E90 Freak View Post
I have a 2006 BMW 325i on St V1 Coliovers.Need your opinions if it will look aggressive and would I need any fender roll required.Give me your opinions/

Front: 18x8.5 et 35 235/45/18
Rear:18x8.5 et 35 245/40/18


Thanks,
E90 Freak
Why only square on the rims, and not the tires? You can do square 255/35 on 18x8.5. That's what I'm running now.
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      11-29-2011, 12:52 PM   #5
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With those tire sizes you are going to have a lot more sidewall than the stock setup. Normally to keep the overall rolling circumference as close to stock as possible, when you increase the tread width (i.e. 225mm to 235mm,) you either stay the same aspect (40, aka 40% of 225 etc) or go the next step lower to 35. You went up in width and then also increased the ratio to the next level. Your speedometer is going to be off by a noticeable amount and your car is also going to look like the tires are much too thick IMO. With the sizes you listed your rear tires will actually be around .6 inches shorter in diameter than the front tires.
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      11-29-2011, 04:13 PM   #6
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Those tire sizes are all over the place, so I would not recommend that setup. For those wheel specs a 235/40/18 all around would be more suitable.
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      11-29-2011, 07:14 PM   #7
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Those tire sizes are all over the place, so I would not recommend that setup. For those wheel specs a 235/40/18 all around would be more suitable.
So you recommend 235/40/18 all around.I wont need any fender roll or anything?
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      11-29-2011, 07:15 PM   #8
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Why only square on the rims, and not the tires? You can do square 255/35 on 18x8.5. That's what I'm running now.
So you have the square setup as well.
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      11-29-2011, 07:15 PM   #9
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      11-29-2011, 07:35 PM   #10
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So you recommend 235/40/18 all around.I wont need any fender roll or anything?
Correct. No fender work necessary with a 235/40/18 on an 18x8.5 ET35 all around.
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      11-29-2011, 08:47 PM   #11
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Correct. No fender work necessary with a 235/40/18 on an 18x8.5 ET35 all around.
Thanks a lot I really appreciate your help
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      11-29-2011, 08:55 PM   #12
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You're welcome!

What tire brand/model were you planning on going with?
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      11-29-2011, 09:22 PM   #13
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You're welcome!

What tire brand/model were you planning on going with?
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