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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 > Need new tires!



Wheels and Tires forum Sponsored by The Tire Rack
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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
/
ASPECT RATIO
- WHEEL DIAMETER
ORIGINAL TIRES
/
NEW TIRES
/
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 %
                     
Speedo @60mph will read: mph
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      02-25-2011, 04:46 PM   #1
Prodigy1
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Need new tires!

Hey guys, I am new to this forum and need some help with which tires to buy.. I am on 20inch m6 wheels now with Pirellis all around. The sizes are 245/30/20 front and 285/25/20 in the back. I really do not like having 25's on the back and was wondering if I can go 30's series all the way around? I checked the back and to me, it looks like it will be fine.. I do have coilovers. I bought these wheels from a guy who had a similar set up as me and from the same car. Is there a reason why people buy smaller series tires in the back other than for looks and of course not to rub? I want to go with Vredestein ultrac Cessanto with 245/30/20 front and 285/30/20 in the back, is this a bad move or should I just stick with what I have and get the same? All the help would be greatly appreciated, Thanks.

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      02-25-2011, 05:00 PM   #2
rice4u
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Quote:
Originally Posted by Prodigy1 View Post
Is there a reason why people buy smaller series tires in the back other than for looks and of course not to rub?
to keep the same diameter as stock wheels and tires originally came with
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      02-25-2011, 08:22 PM   #3
VMRWheels
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2008 5 Series  [3.30]
The thinner tire is to compensate for the larger diameter wheel. You'll want to stick with that if you rather not have any kind of rubbing issues because of the taller tire.

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