A bicycle groupset includes all parts involved in braking, changing gear or running the drivetrain.  The components of a full groupset are: Crankset (also called the chainset), Bottom bracket, Brake levers/shift levers, Rear derailleur (RD), Front derailleur (FD), Cassette, Chain, Brakes. You can buy a complete groupset or individual components. Shimano is the largest manufacturer of these components.   Shimano produces a range of road groupsets for different levels of cycling performance, from entry-level to high-end racing. The performance groupsets...