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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 > Rolling Diameter vs Revolutions per mile



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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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ASPECT RATIO
- 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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      05-31-2013, 11:38 AM   #1
adjojonegoro
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Rolling Diameter vs Revolutions per mile

Iíve just ordered these tires for my 2011 335i xDrive:

Sumitomo HTR III
235/35/19 (F) Ė 816 Revolutions Per Mile
275/30/19 (R) Ė 811 Revolutions Per Mile

The since itís an AWD, I made sure the front-to-back rolling diameter difference is less than 1%. With the above setup, it is actually 0.02%
However, I only realized later after ordering some here have suggested that the front and rear RPMs must be as close as possible, even ideally not more than 3 RPMs difference.

The newly ordered tires would have a 5 RPM difference front/back.

1. Will this cause AWD problems?
2. Should I change the rear tire to 265/35/19 (818 RPMs)? By doing so, I would reduce the front/back difference to 2 RPMs, but at the same time increase the rolling diameter difference to 0.8%
3. Whatís more important, maintain a closer front/back rolling diameter match or RPMs?

Thanks
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      05-31-2013, 11:44 AM   #2
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You will not have any problems with the drivetrain with those tire sizes. Keep the overall diameter about the same and you will be fine.
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      05-31-2013, 12:18 PM   #3
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Thanks so much for this. Extremely helpful :-)
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      05-31-2013, 12:21 PM   #4
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You're welcome!
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      06-03-2013, 04:08 PM   #5
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Quote:
Originally Posted by VMRWheels View Post
You will not have any problems with the drivetrain with those tire sizes. Keep the overall diameter about the same and you will be fine.
+1, very common setup on the Xi.
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