Tehasemõõt 16" veljele ongi E39-l 225/55/16, seega ei aetud sulle isegi mitte teadmatusest jama.
Kui sul on hetkel all 205/65, ehk 19mm suurema diameetriga rehvid ja tegelik kiirus spidomeetri 95km/h järgi on hoopis 90, siis valetab sul spidomeeter 5,3% nende rehvidega. Tehasemõõdus rehvidega valetaks siis 8,2%, mis on reaalselt tõesti natuke palju (mul pole ükski kolmest BMW-st tehasemõõdus rehvidega 100km/h üle 5km/h valetanud), kuid samas mahub rahvusvahelise ette antud vea piiridesse täiesti:
European Union member states must also grant type approval to vehicles meeting similar EU standards. The ones covering speedometers [8] [9][10] are similar to the UNECE regulation in that they specify that:
The indicated speed must never be less than the actual speed, i.e. it should not be possible to inadvertently speed because of an incorrect speedometer reading.
The indicated speed must not be more than 110 percent of the true speed plus 4 km/h at specified test speeds. For example, at 80 km/h, the indicated speed must be no more than 92 km/h.