Further comments on rock stabilization methods 285before the wheel carries any load, with the effect that the weight of the rider
is transmitted by a reduction in tension through the spokes rather than
compression. This allows use of thin spokes, which are capable of with-
standing significant tensile forces whilst being weak in compression. The
alternative is to provide spokes with significant compressive strength, as
in cumbersome timber cartwheels-in the context of rock excavations this
is analogous to the engineer having to provide cumbersome concrete
linings.
Thin spoke
in tensionin compression