Shimano sora 9 speed drivetrain the shimano 9 speed sora groupset is well known for its performance and durability making it the perfect choice for the technique the sora shifters have the same dual control setup as the top end groupsets and also feature an optical window to show which gear you have selected shifting is precise and consistent right the way through the 9 speed cassette tektro hydraulic disc brakes tektro hydraulic disc brakes with 160mm rotors provide huge stopping power