Quote:
Originally Posted by CSBM5
Those are 1 increment is size larger than stock not smaller. It will slightly increase actual speed for the same indicated value. If you haven't coded your car to indicate true speed, it will be showing (speed - 3.1 mph) anyway, so if anything it will indicate a tad closer to true speed.
On my E90 M3 I run the same sizes (stock sizes are same as M2: 245/35-19, 265/35-19), and even with the car coded for true speed, my GPS verified speed is spot on accurate.
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How do you code m2 to show true speed ?
It reads like 275/35/19 is a size that actually makes M2 speedo read more accurately - is this really the case ?