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  #1  
Old 05-02-2013, 07:36 AM
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Odd Wheel and Tire Size Help
I have a 2005 X5 3.0.
I'm considering purchasing a set of wheels:
-18x8.5 front
-18x9.5 rear
I was told to mount 255-55's on the front, and 245-55's on the rear.
The problem is that no tire manufacturer supports both of these sizes in the same model tire.

Are there any other recommendations for tire sizes for these wheels?
Any suggestions are much appreciated.
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  #2  
Old 05-02-2013, 08:04 AM
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pap smear is an unknown quantity at this point
Stock tire size is 255/55/18 so I wouldn't go smaller than that
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Old 05-02-2013, 08:23 AM
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Quote:
Originally Posted by Area51 View Post
I have a 2005 X5 3.0.
I'm considering purchasing a set of wheels:
-18x8.5 front
-18x9.5 rear
I was told to mount 255-55's on the front, and 245-55's on the rear.
The problem is that no tire manufacturer supports both of these sizes in the same model tire.

Are there any other recommendations for tire sizes for these wheels?
Any suggestions are much appreciated.
Find a new tire guy... that makes NOOOO sense!
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Old 05-02-2013, 08:27 AM
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I agree.
Is anyone running 18-9.5 rear and 18-8.5 front?
If so what size tires are you running on them?
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Old 05-02-2013, 08:55 AM
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I dont think you will find many 18" staggered set ups because if you want to maintain stock diameter (29" or so), there are no combinations that have the same diameter front and rear (especially critical as the X is full time AWD).
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Old 05-02-2013, 09:19 AM
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Your tires guy tell you to go with 255 front and 245 rear? WTF is he smoking ? .... Lol
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Old 05-02-2013, 10:48 AM
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Unless you're really sold on these wheels...my suggestion would be to keep shopping. If you're going to stay with 18" wheels...then get a set of 4 that are all the same size. If you're going to go with a staggered set-up...then upsize to 19" or 20" wheels where you have more choices for a set of staggered tires.

When using staggered wheels...you also want to stay within 3% (+/-) overall circumference/diameter on axle-to-axle and/or side to side. Going over 3% (+/-) can screw-up the ABS/DSC/AWD calculations and systems.

Using a simple tire calculator site (1010tires.com)...I found two 18" staggered wheel/tire set-up within the 3% variance:

  • 255/55/18 (fr) 265/50/18 (r) - Nitto NT55 tires (-2.10% diameter variance)
  • 255/55/18 (fr) 275/55/18 (r) - Michelin Lattitude Touring tires (2.98% diameter variance)
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Last edited by Qsilver7; 05-02-2013 at 11:00 AM.
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Old 05-03-2013, 09:23 AM
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Quote:
Originally Posted by mrbmwx5 View Post
Your tires guy tell you to go with 255 front and 245 rear? WTF is he smoking ? .... Lol
wider and taller front than rear.
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