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Tractor Tire Conversion Chart

Standard Tractor Tire Sizes and their Metric Equivalent

Standard Size Radial Size Metric Size

11.2X20  11.2R20  280/85R20 

12.4X20  12.4R20  320/85R20 

9.5X24  9.5R24  250/85R24 

11.2X24  11.2R24  280/85R24 

12.4X24  12.4R24  320/85R24 

13.6X24  13.6R24  340/85R24 

14.9X24  14.9R24  380/85R24 

16.9X24  16.9R24  420/85R24 

18.4X26  18.4R26  420/85R26 

11.2X28  11.2R28  280/85R28 

12.4X28  12.4R28  320/85R28 

13.6X28  13.6R28  340/85R28 

14.9X28  14.9R28  380/85R28 

16.9X28  16.9R28  420/85R28 

14.9X30  14.9R30  380/85R30 

16.9X30  16.9R30  420/85R30 

    420/90R30 

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18.4X30  18.4R30  460/85R30 

12.4X32  12.4R32  320/85R32 

12.4X34  12.4R34  320/85R34 

14.9X34  14.9R34  380/85R34 

16.9X34  16.9R34  420/85R34 

18.4X34  18.4R34  460/85R34 

20.8X34  20.8R34  520/85R34 

12.4X36  12.4R36  320/85R36 

13.6X36  13.6R36  340/85R36 

13.6X38  13.6R38  340/85R38 

14.9X38  14.9R38  380/85R38 

16.9X38  16.9R38  420/85R38 

18.4X38  18.4R38  460/85R38 

20.8X38  20.8R38  520/85R38 

18.4X42  18.4R42  460/85R42 

20.8X42  20.8R42  520/85R42 

20.8X46  20.8R46  520/85R46