THE AXLE

The axle connects the wheels to the rear end of the frame and to the engine through the transmission assembly, consisting of gear wheel, chain, and sprocket. It is the axle that provides traction, making the tires spin.
On straight stretches, the axle sits more or less parallel to the ground; while through bends, centrifugal forces and steering angles cause it to tilt, lifting the rear inside tire from the ground (as in the above illustration). It is thanks to this movement that the axle makes up for the absence of the rear differential.