The groupset is all the parts that make up the drivetrain and brakes of a bike. In other words all parts needed to transfer the power from your legs to the rear wheel to gain speed and all the parts needed to slow down when you want to reduce speed. They vary significantly between disciplines, such as road, gravel and mountain bikes. The pricing can vary enormously with performance gains. The higher the price, the more features, lighter weight and better materials you can expect. And another big jump in pricing between mechanical and electronic derailleur shifting has occurred since the introduction after the introduction of electric shifting on the high level groupsets in all disciplines.

The three big groupset manufacturers found on the majority of bikes are Shimano, SRAM and Campagnolo.