If you want to assemble your bike yourself, you have to find all the parts you need. Different installation lengths, diameters and bicycle standards make the search more difficult. Complete groups provide a remedy. They comprise a complete group of components from one manufacturer. The well-known manufacturers Shimano and Sram have the right group for every application. For example, there are complete groups for mountain bikes, racing bikes, city bikes or e-bikes. Complete groupsets usually include rear derailleur, bike cassette, bike chain, front derailleur, brake and shift levers, brakes, bottom bracket and bike crank with chainrings. Complete groups are also suitable for upgrading existing bikes and replacing old parts.