Quote:
Originally Posted by VMRWheels
yes, if you use the correct diameter tires, you will effectively have the same rolling diameter as your stock 17" tires. Most likely, your stock tires sizes on your E90 are 225/45/17 and 255/40/17. The most common and popular sizes for 19" tires, especially staggered sizes are 235/35/19 front and 265/30/19 rear. With these sizes the overall diameter of both the 235 and 265 are less than 2% larger than your stock tire diameter. You won't throw off your speedometer with such a marginal change. In fact, BMW speedometers are notorious for reading 5-10% over your actual speed. By up sizing your wheels and tires slightly, you'll actually have a slightly more accurate speedometer reading.
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When you are talking about "upsizing" your wheels and tires, you mean increasing the overall tire diameter by getting a larger diameter tire not going from 17" wheels to 19" wheels.