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    Car tyre size calculator

    Calculate tyre size

    Type the car tyre code you want to calculate in the text box, to see the results below. Type your code as it is written on your tyre, for example 195/70R15 (ISO metric tyre code) or 195/620R16 (Japanese tyre code).

    转换

    The ISO metric equivalent of

    nnn/nnRnn
    is
    nnn / nn R nn

    Nominal width of tire in mm Height of sidewall in % of width R=radial Rim diameter code

    Your tyre dimensions, metric:

    • Width, mm

    • Height of sidewall, % of width

    • Height of sidewall, mm

    • Fits rim diameter, mm

    • Tyre diameter, mm

    • Rolling circumference, mm*

    • Tyre circumference, mm

    • Rolling radius, mm

    • Wheel radius, mm

    • Revoluions per km

    Your tyre dimensions, British/American:

    • Width, in

    • Height of sidewall, % of width

    • Height of sidewall, in

    • Fits rim diameter, in

    • Tyre diameter, in

    • Rolling circumference, in*

    • Tyre circumference, in

    • Rolling radius, in

    • Wheel radius, in

    • Revolutions per mile

    * To calculate rolling circumference Convertworld uses the tyre dimensions at a factor of 0.96 to simulate the slight reduction of radius which occurs when a tyre is fitted to a car and meets the ground.

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