ABSTRACT
The kernel of the bike mechanic's craft is therefore skilled diagnosis. There are two available sources from which a mechanic produces their diagnosis. First, there is the factual information that they have to learn by rote. The second source for producing a diagnosis of the problem is the data derived from investigation, and then applying an experimental method to mechanical systems. The central principle of the AW-3 is that, in certain gears, the sprocket turns at a different speed than the hub, and the difference varies depending on which gear is selected. In first gear, the sprocket turns four rotations for every three rotations of the hub; in second gear, the ratio is one-to-one, and in third, the ratio is the inverse of first gear, meaning that for every three rotations of the sprocket the hub rotates four times. First gear is essentially the same process as third, but with some elements of the process in reverse order.
