Tread Widths—Singles or Duals

Approximate tread ranges for each tire size are shown in the following chart:

IMPORTANT: Use of clamp-on dual wheels is not allowed. A separate hub is required for each dual or triple tire.

NOTE: See Observing Tread Width Limitations in this section.

TREAD WIDTH—SINGLE WHEELS
	Inner Tire Range
Tire Size	(Minimum—Maximum)
710/70R38	1782—2477 mm (70.2—97.5 in.)
710/70R42	1782—2477 mm (70.2—97.5 in.)
800/70R38	1876—2630 mm (73.9—103.5 in.)

TREAD WIDTH—DUAL WHEELS
	Inner Tire Range	Outer Range
Tire Size	(Minimum—Maximum)	(Minimum—Maximum)
18.4R46 Cast/Steel	1530—1910 mm (60.0—75.2 in.)	2968—3348 mm (116.9—131.8 in.)
480/80R46 Cast/Steel	1530—1910 mm (60.0—75.2 in.)	2968—3348 mm (116.9—131.8 in.)
480/80R50 Cast/Steel	1530—1910 mm (60.0—75.2 in.)	2968—3348 mm (116.9—131.8 in.)
20.8R42 Cast/Steel	1600—2063 mm (63.0—81.2 in.)	2987—3450 mm (117.6—135.8 in.)
520/85R42 Cast/Steel	1600—2063 mm (63.0—81.2 in.)	2987—3450 mm (117.6—135.8 in.)
520/85R46 Cast/Steel	1600—2063 mm (63.0—81.2 in.)	2987—3450 mm (117.6—135.8 in.)
620/70R42 Cast/Steel	1689—2063 mm (66.5—81.2 in.)	3240—3615 mm (127.6—142.3 in.)
620/70R46 Cast/Steel	1689—2063 mm (66.5—81.2 in.)	3240—3615 mm (127.6—142.3 in.)
650/85R38 Cast/Steel	1722-1966 mm (67.8—77.4)	3372-3648 mm (140.2—143.6)
710/70R38 Cast/Steel	1782—1844 mm (70.2—72.6 in.)	3562—3624 mm (140.2—142.7 in.)
710/70R42 Cast/Steel	1782—1911 mm (70.2—75.2 in.)	3562—3691 mm (140.2—145.3 in.)
800/70R38 Cast/Steel	1876—2188 mm (73.9—86 in.)	3763—4077 mm (148—160.5 in.)