Det er ikke dette du spør om, men her er det ideelle :For 50-series tyres and above, the rim width is 70% of the tyre's section width, rounded off to the nearest 0.5.
For example, a P255/50R16 tyre, has a design section width of 10.04" (255mm = 10.04inces). 70% of 10.04" is 7.028", which rounded to the nearest half inch, is 7". Ideally then, a 255/50R16 tyres should be mounted on a 7x16 rim.
For 45-series tyres and below, the rim width is 85% of the tyre's section width, rounded off to the nearest 0.5.
For example, a P255/45R17 tyre, still has a design section width of 10.04" (255mm = 10.04inces). But 85% of 10.04" is 8.534", which rounded to the nearest half inch, is 8.5". Ideally then, a 255/45R17 tyre should be mounted on an 8½x17 rim.
Det ideelle for dekk med 45 profil eler lavere er altså at felgen skal være 85%av dekkets bredde. Høyere profil er det 70% av dekkets bredde.
Her er adressen dette er hentet fra, står mye om dekk der.
http://www.carbibles.com/tyre_bible.html