Shimano Ultegra / Dura-Ace Di2 Time Trial Disc Groupset - 12-Speed (Fully Wired) A premium Shimano Di2 Time Trial groupset combining Dura-Ace R9100-series TT controls with Ultegra R8100 12-speed drivetrain components . Important: Unlike the current Ultegra/Dura-Ace road Di2 systems, this setup is not wireless . It is a fully wired Di2 configuration , purpose-built for time trial and triathlon use, and utilizes a combination of legacy SD50 wiring and current-generation SD300 wiring , linked via the appropriate Shimano converter. This ensures full Di2 functionality while maintaining compatibility with TT bar-end controls. Compatibility: Time Trial / Triathlon (Disc Brake, Di2) Speed: 12-speed Brake Type: Hydraulic Disc Di2 Configuration: Fully wired (non-wireless) Included Components Controls & Brakes Shimano Dura-Ace STR9180 hydraulic brake/shifters - Includes hydraulic disc brake calipers and hoses Shimano Dura-Ace SW-R9160 bar-end Di2 shifters (pair) Drivetrain Shimano Ultegra R8100 crankset Shimano Ultegra RD-R8150 rear derailleur (Di2, 12-speed) Shimano Ultegra FD-R8150 front derailleur (Di2, 12-speed) Shimano Ultegra cassette (12-speed) Shimano Ultegra 12-speed chain Braking Shimano disc brake rotors: Di2 Wiring & Electronics (Complete - Fully Wired) This groupset uses a hybrid Di2 wiring architecture , combining SD50 (R9100-series) and SD300 (R8100-series) components: 2 SD50 cables (bar-end shifters brake lever/shifters) [750mm] 2 SD50 cables (bar-end shifters SD50 junction box) [750mm] 1 SD50 4-port junction box 1 SD50 to SD300 port converter 1 SD50 cable (junction box SD50/SD300 converter) [150mm] 1 SD300 cable (converter battery) [1400mm] 1 SD300 cable (battery front derailleur) [900mm] 1 SD300 cable (battery rear derailleur) [1200mm] Shimano Di2 internal battery This configuration provides reliable, wired Di2 shifting with no wireless cockpit components. Battery Mounting Note: To mount the battery inside the seatpost, you may need a frame specific battery holder or a custom mounting solution, depending on the frame design. Key Features Fully wired Di2 system (no wireless shifting) Compatible TT-specific bar-end controls Hybrid SD50 / SD300 wiring for cross-generation Di2 integration Hydraulic disc braking with aero TT ergonomics Complete, ready-to-install Di2 setup Ideal For Time trial bikes Triathlon bikes Riders preferring a fully wired Di2 system for maximum reliability