A spoke is one of some number of rods radiating from the center of a wheel, connecting the hub with the round traction surface.
A spoked wheel on display at the National Museum of Iran, in Tehran. The wheel is dated to the late 2nd millennium BCE and was excavated at Choqa Zanbil.
The remains of a pair of cart wheels with metal axle assembly.
An ox-wagon in Aliwal North, South Africa. Note the three missing spokes and the metal tire.
Wooden spoke wheel with metal rim from antique truck on display in Underground Atlanta.
A spoke nipple holds a bicycle wheel's rim to each spoke.
Nipples 12 and 16 mm