Converting Imperial to Metric

this useful table below, shows all the imperial sizes with their metric equivalent. Some manufacturers (including Michelin) still use imperial sizing so it is imperative to ensure you get the correct size tyres for your agricultural machinery.

IMPERIAL TYRE SIZE	EQUIVALENT METRIC TYRE SIZE
11.2×20	280/85R20
12.4×20	320/85R20
9.5×24	250/85R24
11.2×24	280/85R24
12.4×24	320/85R24
13.6×24	340/85R24
14.9×24	380/85R24
16.9×24	420/85R24
18.4×26	420/85R26
11.2×28	280/85R28
12.4×28	320/85R28
13.6×28	340/85R28
14.9×28	380/85R28
16.9×28	420/85R28
14.9×30	380/85R30
16.9×30	420/85R30 OR 420/90R30
18.4×30	460/85R30
12.4×32	320/85R32
12.4×34	320/85R34
14.9×34	380/85R34
16.9×34	420/85R34
18.4×34	460/85R34
20.8×34	520/85R34
12.4×36	320/85R36
13.6×36	340/85R36
13.6×38	340/85R38
14.9×38	380/85R38
16.9×38	420/85R38
18.4×38	460/85R38
20.8×38	520/85R38
18.4×42	460/85R42
20.8×42	520/85R42
14.9×46	380/90R46
16.9×46	420/80R46
18.4×46	480/80R46
20.8×46	520/85R46
18.4×50	480/80R50

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