Shimano Dura-Ace ST-R9180 Di2 TT Shift/Brake Lever with Wire - Left 2x For TT Bars Black. The Shimano Dura-Ace ST-R9180 Di2 TT/Triathlon Shift/Brake levers for 2x 11-Speed systems bring confidence to the sleekest bikes in the world. Combined with the plug and play ease of Shimano Di2 electronic shifting they offer an advantage in any race.More aerodynamic with better grip feeling allows for optimum power to be transmitted while maintaining a firm gripIntergrated switch button inside offers intuitive shifting control without hand releaseSingle button on each side of the shifting lever only works with Shimano Synchronized ShiftGives riders better control and confidence in race conditionsEach switch has the option for multi-shift ON or OFF for customizable functionality to fit rider’s riding styleClean cockpit area achieved with integrated E-TUBE cable and internal brake cable routing