Axletree

n.	1.	A bar or beam of wood or iron, connecting the opposite wheels of a carriage, on the ends of which the wheels revolve.
	2.	A spindle or axle of a wheel.

Noun

1.

axletree - a dead axle on a carriage or wagon that has terminal spindles on which the wheel revolve

axle bar, carriage, cart, dead axle, equipage, rig, waggon, wagon