én ezt már elengedtem..megmértem 10x és ami a legtöbbször jött ki kb azt irtam be de tudom az se pontos semnennyire sem eleve egyenesen sem lehet tolni teljesen meg aztán na.. mindegy is szerintem az 5-10mm belefér...

ezt találtam egyszer a témába a pontossággal kapcs.:
"
The cycle computer will over-report your speed by a factor of 2143 / 2096, which amounts to about 2%. The speed calculated by the computer is circumference * cadence, so if the circumference is 2% too big, then the speed will also be over-reported by 2%.
Conversely, your actual speed will be about 2% smaller than what your cycle computer reports: a factor of 1 - 2096 / 2143. So if the computer says you're moving at 30 km/h, you'll actually be moving at about 29.3 km/h. The average speed will scale in exactly the same way as the instantaneous speed.
In general, if your true wheel circumference is a, the value you've put into the computer is b, and the reported speed is v, then the true speed will be a / b * v.
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