wheel dia(mm)	tread width(mm)	capacity per caster	wheel material	bearing	approx weight per caster(kg)	loading height(mm)
50(2")	25	60	Nylon	Double Ball Bearing	0.41	76
		55	High-strength artificial rubber
		60	Super polyurethane
		60	High-strength artificial rubber
63(2^½")	30	80	Nylon		0.7	93
		75	High-strength artificial rubber
		80	Super polyurethane
		85	High-strength artificial rubber
75(3")	32	85	Nylon		0.75	108
		80	High-strength artificial rubber
		85	Super polyurethane
		85	High-strength artificial rubber
100(4")	32	110	Nylon		0.84	134
		100	High-strength artificial rubber
		110	Super polyurethane
		110	High-strength artificial rubber
125(5")	32	120	Nylon		0.95	157
		110	High-strength artificial rubber
		120	Super polyurethane
		120	High-strength artificial rubber