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A bicycle drivetrain is the set of various components designed to work together. In the specific case where all the mechanical parts of a drivetrain have been produced by the same company and belong to the same category, it is used the term groupset.
Campagnolo proposed the first complete 'Record' groupset to the public in 1960 on the Legnano Roma Olimpiade. Since then, the evolution has been amazing, technologies have changed, and every year the best brands present their novelties, all to be discovered!
The bicycle drivetrain includes the chain, crankset, bottom bracket, cassette with rear sprockets, front derailleur and rear derailleur.