Function

• A transmission chain being pulled along a sprocket wheel.chain saw image by Pali A from Fotolia.com
  
  The most common motorcycle chain is a transmission chain, or roller chain. These chains fit over sprocket gears, which are round and fitted with teeth that grab and pull the chain. An engine will rotate these gears that pull the chain transferring the energy and turning other gears. This is what allows the wheels of the bike to rotate from engine power.
  
  

Parts

• A transmission chain consists of inner and outer links. The inner links have small metal plates connected by two metal sleeves or bushings. The outer links are wider and fit on the outside of the inner links with pins that slip into the sleeves and hold the structure together. These links roll with each other creating a chain that can bend and move with very little friction.
  
  

Maintainence

• Although motorcycle chains have low friction, over time the pins and bushings will develop fatigue. Keeping the chain lubricated helps prevent friction from causing unnecessary wear and tear. Inspect the chain for cracks in the plates and rollers, rotated pins, and any signs of visible wear.