| 摘要 |
An exercise bicycle comprises a main body 8, a sprocket wheel 3, a shaft 2 which passes through an aperture in the sprocket wheel 3. On either side of the shaft 2 there is disposed a crank assembly 4,400. One crank 400 is fixed in position in relation to the sprocket wheel, and the other 4 may be adjusted. Protrusion 42 on a hollow sleeve 40 of the crank may be located in aperture 30 or 31, allowing the crank to be positioned at two positions spaced 180‹ from each other as shown in figure 3B. |
