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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 Radius Question 325/330 SP/nonSP



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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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  Difference in diameter (in.)
           Percent Difference %
                     
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      06-08-2005, 11:31 AM   #1
johnfkitchen
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Rolling Radius Question 325/330 SP/nonSP

Looking for help. The brochure gives gear and final drive ratios, but I have not seen mph/1000 rpm figures.

Does anyone know if the different wheels on 325 vs 330 and Sports Pack vs not Sports Pack makes a difference to rolling radius, and hence the mph/1000 rpm?

I want the data to build into an Excel model, which, if I get it working, I'll publish for you all.

Cheers

John
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      06-08-2005, 04:09 PM   #2
segfault
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Tire size calculator including rolling radius:
http://www.miata.net/garage/tirecalc.html

Rolling radius should be approximately the same for all E90s...
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      06-08-2005, 04:59 PM   #3
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why use miata.net's calculator when we have our own in the wheel and tire forum (at the top of the forum).

as for the diameter, the overall diameter is the same no matter which e90 you get.. the larger wheels on a 330 is balanced by smaller tires to achieve the same overall diameter, which is the key.
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      06-08-2005, 05:42 PM   #4
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Quote:
Originally Posted by MarkE90M3
why use miata.net's calculator when we have our own in the wheel and tire forum (at the top of the forum).

as for the diameter, the overall diameter is the same no matter which e90 you get.. the larger wheels on a 330 is balanced by smaller tires to achieve the same overall diameter, which is the key.
Thanks guys, I should have looked at the wheel and tire forum. Sorry to be so stupid.
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      06-09-2005, 10:54 AM   #5
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Quote:
Originally Posted by MarkE90M3
why use miata.net's calculator when we have our own in the wheel and tire forum (at the top of the forum).
The miata.net one displays properly in Safari--our own does not:


Last edited by segfault; 06-09-2005 at 11:02 AM.
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      06-09-2005, 11:08 AM   #6
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that sucks! ill try to fix it, sent you a PM
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      06-09-2005, 01:01 PM   #7
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Thanks. I never got into web development--these things can be a real pain in the butt!
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      06-09-2005, 01:13 PM   #8
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I need one mph/1000 rpm number please. For a USA version, 325 or 330 (need to know which), auto or manual (need to know which), and if it's not for 6th gear, please tell me. Thanks!
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