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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 > N00b question...



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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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      05-16-2005, 03:36 PM   #1
roburado
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N00b question...

Say I get 19 or 20 inch wheels. Does the odometer need to be reprogrammed or something? I think I heard that somewhere. Don't know if it's true.
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      05-16-2005, 04:26 PM   #2
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Nope, it definatly does not need to get reprogrammed.

The reason is that even though your buying bigger rims, you'll be getting smaller tires, so that the overall wheel+tire combo will be the same size as stock. As long as the overall size is the same, then the car doesnt notice a difference and the speedo will be on check.

You can actualy use the calculators on the top of the wheel and tire forum to see how much of a difference there will be in the speedo with your new tire setup. Use the boxes on the right to set in a new tire size

For example, I used 19" wheels with my E46 once, and I put on 235/35/19 tires on the wheels, with that setup, according to the calculator, there is only a 1.53% difference, and my speedometer will read 61mph (when im really going 60mph), not enough of a difference to really matter
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      05-16-2005, 06:48 PM   #3
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Quote:
Originally Posted by MarkE90M3
Nope, it definatly does not need to get reprogrammed.

The reason is that even though your buying bigger rims, you'll be getting smaller tires, so that the overall wheel+tire combo will be the same size as stock. As long as the overall size is the same, then the car doesnt notice a difference and the speedo will be on check.

You can actualy use the calculators on the top of the wheel and tire forum to see how much of a difference there will be in the speedo with your new tire setup. Use the boxes on the right to set in a new tire size

For example, I used 19" wheels with my E46 once, and I put on 235/35/19 tires on the wheels, with that setup, according to the calculator, there is only a 1.53% difference, and my speedometer will read 61mph (when im really going 60mph), not enough of a difference to really matter
Cool. thanks.
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