ISO 4251-1:2005

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ISO 4251-1:2005, Tyres (ply rating marked series) and rims for agricultural tractors and. machines – Part 1 : Tyre designation and dimensions, and approved rim contours.

ISO 4251-1:2005, titled "Tyres (ply rating marked series) and rims for agricultural tractors and machines — Part 1: Tyre designation and dimensions, and approved rim contours," specifies the designation and dimensions of tyres marked with ply ratings for agricultural tractors and machines. It also defines the approved rim contours compatible with these tyres.