Shimano Tiagra ST-R4020 2 Speed STI Bled with BR-RS405 Flat Mount Caliper, Left Rear

The Shimano Tiagra ST-R4020 STI lever paired with the BR-RS405 flat mount caliper delivers dependable hydraulic disc braking and smooth 11-speed shifting, making it an ideal upgrade or replacement for modern road bikes. Designed with Shimano’s renowned Dual Control technology, this unit combines gear shifting and braking into a single, ergonomically refined lever for intuitive operation and improved control on the road.

The slim lever body features an updated ergonomic shape and reduced reach, ensuring comfortable use for a wide range of hand sizes. A short shift arc follows natural hand movement, enabling faster, more precise gear changes with minimal effort. The hydraulic braking system provides powerful, consistent stopping performance in all conditions, with excellent modulation—particularly when riding on the hoods.

Pre-bled for convenience, the system includes the BR-RS405 flat mount caliper, hose, pads, and gear cable, allowing for straightforward installation. Shimano’s reliable mineral oil system and easy-bleed design help keep maintenance simple while ensuring long-term performance.

Key Features:
- Shimano Tiagra R4020 series, 11-speed compatible
- Dual Control lever integrates braking and shifting
- Hydraulic disc brake system for powerful, consistent stopping
- Ergonomic design with adjustable reach for enhanced comfort
- Short shift stroke for quick, precise gear changes
- Flat mount BR-RS405 caliper with pre-bled hose included
- Auto-adjusting pad clearance for consistent braking as pads wear
- Compatible with Shimano 11-speed road drivetrains (e.g. FD-R4000)

This left-hand rear unit offers a balance of performance, reliability, and value, bringing trickle-down technology from Shimano’s higher-end groupsets into a practical, rider-friendly package.