Agricultural tyre size markings

Agricultural tyre size markings

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16.9 R30
16.9 Tyre section width (in inches) when mounted on are commended rim
R Radial construction
30 Nominal diameter of rim (in inches)

580/70 R38
580 Tyre section width (in mm) when mounted on a recommended rim
70 Aspect ratio (%)
R Radial construction
38 Nominal rim diameter (in inches)

Tyre dimensions

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S Tyre section width
R’ Loaded radius
R Unloaded radius
D Exterior diameter = 2 R
ø Interal diameter