Shimano ST-R4020 Tiagra mechanical shift hydraulic STI lever, 11-speed

Shimano ST-R4020 Tiagra mechanical shift hydraulic STI lever 

Experience precise shifting and confident braking with the Shimano Tiagra ST-R4020 left-hand hydraulic disc brake and shift lever. Its slim, ergonomic design fits naturally in your hand, while the short shift arc allows rapid and accurate 2-speed gear changes with minimal effort. The hydraulic brake lever delivers powerful, controllable stopping performance, especially from the hood position, and the auto-adjusting reservoir maintains consistent pad-to-rotor clearance as pads wear. With tuneable reach adjusters and an easy-to-bleed hydraulic system using Shimano mineral oil, this lever provides reliable performance and smooth operation. Compatible with 11-speed chains and RD-R4000 or RD-U6040 rear derailleurs, it’s a smart upgrade for riders seeking efficiency, comfort, and dependable braking.