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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 > Mismatched Offsets



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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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      09-05-2012, 08:19 AM   #1
crely
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Mismatched Offsets

Hello,

I am in a bit of a quandary. I have gunmetal Forgestar F14 wheels on my 2007 BMW 335i and recently got a flat on the right rear (19x10 275/30/19 tire). I needed new tires anyway so I went ahead and ordered two new Hankook Ventus V12s for the rears. When they removed the old tires and inspected the rim, they found a ĺĒ crack on the inside lip of the rim where the tire sits against the metal. I called several rim repair shops and most recommended that I do not try to repair the rim and just buy a new one. I live in Baltimore city and 90% of my driving is 80 mph around rt. 495 so my rims unfortunately take a beating and I need an uncompromised wheel. Hereís the issue... I bought the car with these wheels on it and since they are Forgestars, they were ordered with a custom offset. Iíve tried measuring the offset but I simply do not trust my measurements to be accurate within a millimeter margin of error. Iíve talked to tires shops, **********s, and the previous owner of the car to figure out what offset my cracked wheel is. Iíve been able to determine that the offset is between 33et and 38et. Hereís my question. If my left and right rear wheels have a different offset by a maximum of 6mm, is that going to cause adverse affects on handling or suspension durability? Also, itíll take 6 weeks for me to get this rim after itís ordered and Iím driving a minivan until the car is drivable. That hurts. The rims are $430 a piece so Iíd like to avoid buying two if I can get away with just ordering one replacement. Thank you in advance and please let me know what you all think.

-Chris
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      09-05-2012, 09:12 AM   #2
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Call Forgestar and give them the serial #s. Do it once, do it right.
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      09-05-2012, 01:09 PM   #3
crely
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Good advice. I called Forgestar and they said that the rim should be repairable. Although even the rim repair places say it'd be best to order a new rim. Forgestar also said that the serial number is printed on the outside of the wheel barrel where the tire in coving it. If I take the tire off I should be able to send them the serial number and get the offset.

Now my question is whether to but a new one or have confidence in what the Forgestar guy said and try to repair it.
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      09-05-2012, 08:06 PM   #4
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Call the previous owner and ask him to search his email inbox for the invoice number. Forgestar can pull up his order in their system and they'll have all the info they need. Full name, street address, phone number, invoice number may all work depending on the system they use.
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      09-06-2012, 04:18 PM   #5
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plenty of wheels get welded, worth a shot, if it cracks again get a new one, dont weld it twice. plus take the tyre off and look at serial number then ask.
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      09-06-2012, 06:35 PM   #6
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OP, sorry to hear about your situation. It's not the first time I've heard about Foregestar wheels crapping out, whether its the clearcoat finish or easily bending. Given a 6mm difference, I would think running a 5mm spacer on the higher side which would be close enough.
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