While we are going to look at the M4000 series from the 2018 edition of Shimano Altus the origins of this groupset remain the same and the design changes have a direct impact on performance. The Altus groupset consists of the whole range of components including, derailleurs, shifters, cranksets, brakes and bottom brackets. Found on both entry and mid-level MTB’s and hybrids, this groupset has been there in the market for a long time and seen constant upgrades to get maximum performance at pocket friendly price.