If you dream of the treadmill, then such dream shows the attempt that did not pay off. The dream warns you to stop doing whatever you were doing, because it does not bring any positive results.
Dream dictionary: treadmill dream meanings
Seeing a wheel in a dream means difficult situation, which is impossible to solve. On the other hand, a wheel means continuation of situations and the ability to proceed towards goals. Losing a wheel of a vehicle shows losses and mistakes. Seeing a treadmill represents your feelings will not advance despite your hard work. You feel stuck in a rut.