Why is the spoke wheel faster than the solid round? (For detailed scientific answers)
Spoke wheel relative to the solid round, belonging to the evolution of the function, give up the excess part, leaving only the functional part, that is, the spokes, used to support the body weight.
If you do not consider gravity, loss, resistance, pavement and other aspects of the real world of physical factors, theoretically the same diameter of the two wheels traveling speed is the same.
Laxative, do not understand, do not answer.