Shimano Ultegra Di2 ST-R8170 / BR-R8170 Hydraulic Disc Shift Lever — Left/Front, 12-Speed, 1000mm J-Kit, Road Bike

Shimano Ultegra Di2 ST-R8170 with BR-R8170 is a pre-bled left/front electronic shift and hydraulic disc brake unit for 12-speed road and all-road bikes.

Ultegra Di2 electronic shifting with hydraulic power — genuine Shimano, brand new.

Will it fit? This is the left lever / front brake with a 1000 mm hose, supplied as a pre-filled J-kit (lever + flat-mount caliper + hose). For Shimano 12-speed Di2 road systems (Ultegra R8100 Di2). Flat-mount caliper; pair with a Center Lock rotor (sold separately).

Key Specifications

Technology Highlights

• ✓ Semi-wireless Di2 — fast, precise electronic shifting from the left control.
• ✓ Hydraulic disc braking — powerful, consistent stopping in all conditions.
• ✓ Pre-bled J-kit — factory-filled with mineral oil for fast installation.
• ✓ Flat-mount caliper — clean integration with modern road frames/forks.

What's in the Box

• 1 × Shimano Ultegra Di2 ST-R8170 left shift/brake lever
• 1 × BR-R8170 flat-mount caliper
• Pre-connected 1000 mm hydraulic hose (pre-bled)
• Mounting hardware & Shimano documentation