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Richard Hammond

Vehicle & Alternative fuels news

A tyre is referenced as "185/60R/15H", here is an explanation.
A/B/C

A = Width of Tyre (mm) In this example it shows that the tyre is 185mm wide.

B = Profile as a % of width. (i.e. profile is 60% of width) In this example the ratio is 60%. This works out as 111mm.

C = Diameter of inner rim. In this example it shows that the rim is 15" in diameter. From this you can also work out your rolling circumference. e.g. (2 x B) + C = diameter = d therefore (2 x 111 = 222) + (15" x 25.4 = 381) = 603mm circumference = pi x d = 3.142 x 603 = 1895mm