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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 > Sport Package Tires



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      10-26-2005, 03:17 PM   #1
swu
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Sport Package Tires

Anyone know why are the rear tires thinner than the front tires in the sport package?
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      10-26-2005, 10:05 PM   #2
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If by 'thinner' you mean narrower, on the 330i SP the fronts are 1/2" thinner.

Front: 18x8 225/40/18
Rear: 18x8.5 255/35/18.
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      10-26-2005, 10:22 PM   #3
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they're not.
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      10-27-2005, 01:01 AM   #4
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i think he means the sidewalls being thinner
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      10-27-2005, 07:28 AM   #5
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Sorry for the confusion...... I have a sport 325i, and the front tires are 225/45/17 and rear are 255/40/17. I'm wondering why the front tires are 45, while the rear are only 40?
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      10-27-2005, 11:02 AM   #6
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Quote:
Originally Posted by swu
Sorry for the confusion...... I have a sport 325i, and the front tires are 225/45/17 and rear are 255/40/17. I'm wondering why the front tires are 45, while the rear are only 40?
The second number is not representing exact height of the sidewall. It is a percentage of the tire width. In your case you should take 45% of 225 millimeters and this would give you the sidewall height for the front tire, which is 101.3 and 40% of 255 for the rear = 102. That means the both tires have almost the same height, but the rear one more wider.
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      10-28-2005, 07:38 AM   #7
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Quote:
Originally Posted by bmw330e90
The second number is not representing exact height of the sidewall. It is a percentage of the tire width. In your case you should take 45% of 225 millimeters and this would give you the sidewall height for the front tire, which is 101.3 and 40% of 255 for the rear = 102. That means the both tires have almost the same height, but the rear one more wider.


Ar...... stupid me!! Thanks for the clarification.
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