Tractor Tires
The numeric codes on tractor tires since 1955 have required either two or three numbers: W-D or H/W-D where 'W' is the width of the tire in inches, D is the diameter of the rim in inches and H (if provided) is the percentage height of the tire. Hence, 5.00-15 is a tire that will fit a 15-inch-diameter (380 mm) rim and is 5 in (130 mm) wide but of indeterminate height. 25/5-16 is a tire that has a 5 in (130 mm) width, fits a 16-inch-diameter (410 mm) rim and whose height is approximately 25 in (640 mm).
Read more about this topic: Tire Code
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