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Simple machines on a bike

After understanding at least levers and wheels, find the simple machines on a bike.
Science content (2016 curriculum): 
Physics: Motion and Forces, Newton’s Laws, Gravity (K, 2, 6)
Physics: Simple and complex Machines (5)
Lessons activity is in: 
  • a bike with lever brakes

A bike is a compound machine - an assembly of several simple machines.
Find the simple machines in a bike, and whether the force in is less over greater distance or more over less distance.

Wheel and axle: The wheels, pedals, crankset, cassette
Levers: brakes, gear shifters, handlebars
Inclined planes and wedges: Screws holding it together, teeth on the chain rings. Tyre repair kit (also a lever).
Pulleys: chain on gears. Parts of the shifting mechanisms, braking mechanisms, and the drive train (chain on gears).

See attachment for stand-alone activity, finding levers on a bike.

Attached documents: 
Grades taught: 
Gr 4
Gr 5
Despina Petrellis
Lindsay Izat
Teaching site: 
Carnarvon Elementary