this post was submitted on 18 Oct 2025
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If it didn't, it would be pretty damn annoying as cars always show higher than actual speed. I've had to set our BMW to do +8km/h so that it actually does 120km/h on GPS and not 112.
Although that is true, your car is quite extreme in that regard. In Germany cars are not allowed to deviate by more than 3kph at speeds below 100, and 3% at speeds above 100. I doubt BMW uses different speedometer for cars sold in foreign countries so I'm pretty sure there is something wrong with yours. Maybe you installed smaller diameter tires than from factory?
Hmmh, could be, though both are "from the factory", the winter/summer tires are slightly different sizes. But the allowed error in the EU overall (or at least in Finland) is 10% +4km/h, so it's still well withing "spec".
Are your tires fully inflated?