Question: what parts of my bike should i lube?
Answer: The Chain. John Howard/Digital Vision/Getty Images. ... 
Derailleur Assemblies. Your front derailleur and rear derailleur are what moves the chain between gears when you shift. ... 
Brake and Derailleur Cables. ... 
Brake and Shifter Levers. ... 
Brake Assemblies. ... 
Pedals.