Jenson USANew · Checked Nov 4, 2026, 3:23 AM
$185.00In stockVisit store
Shifters
Shimano GRX ST-RX400-L Left Shift / Brake Lever
Left · hydraulic brake / front shift
Requires Companion Components
Independently sold control requires its compatible opposite-side control and brake system.
Compatibility: reviewed
Known specifications can be used by the compatibility engine.
Retailer offers
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Technical data
Specifications
- Weight
- 306 g
- Speeds
- 10-speed
- Supported speeds
- 10-speed
- Compatible drivetrain families
- Shimano GRX mechanical 10-speed
- Front speeds
- 2x
- Shift actuation
- Mechanical
- Control style
- Drop Bar Integrated
- Brake control interface
- Hydraulic Mineral Oil
- Control clamp diameter
- 23.8 mm
- Included control sides
- Left
- Left control functions
- Brake, Front Shift
Catalog trust
Evidence and freshness
Technical-source dates and retailer offer checks are separate. A retailer check does not validate compatibility.
Report a correction- Technical review
- Oct 6, 2026
- Compatibility review
- Reviewed Oct 6, 2026
Approved technical sources
- Shimano 2026 GRX component ordering catalog
- set.shimano.co.jp/bc_catalog/gravel.pdfManufacturerSource checked Aug 6, 2026Evidence reviewed Oct 6, 2026
- Shimano specifications: ST-RX400-L
- productinfo.shimano.com/en/spec/gravel-shiftbrake-lever-hydraulic-disc-brakeManufacturerSource checked Sep 25, 2026Evidence reviewed Sep 25, 2026
- Jenson exact retail package confirmation
- jensonusa.com/shimano-grx-st-rx400-shifter-front-2-speedRetailerSource checked Oct 6, 2026Evidence reviewed Oct 6, 2026