[list][br][*]Use the big blue dot to pedal back and forth.[br][*]Move the blue and red sliders to shift gears.[br][/list]

[list=1][br][*]How does the size of the front and back gear wheels affect the bicycle motion?[br][*]Which combination would you use to go fast downhill?[br][*]Which combination would you use to climb up a steep [br][*]For further reading see [url]http://en.wikipedia.org/wiki/Bicycle_gearing[/url][br][/list]