Hittade en kalkylator på nätet:
http://www.powerdog.com/tiresize.cgiJag fick nedanstående resultat, som visar att om jag tar 215/60/R16-däcken så kommer hastighetsmätaren att visa 97 km/h när jag kör 100 km/h. Dessutom kommer distansräknaren att visa fel med 3.3%. Då trippmätaren visar 3000 mil har man alltså kört 3100 mil.
En fördel med större däck borde vara att bilen blir bekvämare. Frågan är dock om det finns några andra nackdelar, förutom felvisningen på instrumenten.
Tire size results
Specification Sidewall Radius Diameter Circumference Revolutions Speedometer Odometer Difference
215/55-406 118mm 321mm 643mm 2020mm 495/km 100km/h 15000km N/A
215/60-406 129mm 332mm 664mm 2087mm 479/km 97km/h 14515km 3.3%
Column definitions
Circumference
The circumference of the tire.
Diameter
The diameter of the tire.
Difference
The percentage difference in size between the reference (first) tire and a subsequent tire.
Odometer
The reported odometer reading compared to the reference (first) tire. For example, if the reference tire is listed as 10000mi and a subsequent tire is listed as 9500mi, that means the subsequent tire will report 9500mi traveled when the vehicle actually traveled 10000mi.
Radius
The radius of the tire.
Revolutions
The number of times the tire rotates per mile or kilometer.
Sidewall
The sidewall height of the tire.
Specification
The tire specification as determined by the calculator.
Speedometer
The reported speedometer reading compared to the reference (first) tire. For example, if the reference tire is listed as 60MPH and a subsequent tire is listed as 55MPH, that means the subsequent tire will report 55MPH when the vehicle is actually traveling at 60MPH.