The 9120 shifters feature a re designed brake hood that is more comfortable to grip especially for those with smaller hands the shifters also offer up to 14mm of reach adjustment the shifter hood has been slimmed down considerably from previous hydraulic sti shifters and is close in size and shape to the mechanical brake lever the 9170 brake calipers have been tuned to perform optimally in road racing conditions they feature the shimano flat mount system for a sleek and aerodynamic profile