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      05-16-2005, 07:48 PM   #3
roburado's Avatar

Drives: '03 Passat, '09 Cayman S
Join Date: Apr 2005
Location: Troy, MI

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1991 318is  [0.00]
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.
E30 1991 318is, Red on Black Leatherette

Family History: Two E21 320i, One E28 535is, One E34 535i, One E34 540i