Shimano GRX ST-RX810-R 11 Speed Right Shift/Brake Lever Orange Seal ZERO LOSS ZERO LOSS simply

ZERO LOSS ZERO LOSS simply means

Shimano Hydraulic Disc Brake Fluid

and there are also 4 manual speed settings should you want to set your own ideal airflow

please see 10-Speed Hyperglide non-directional chains

and more comfortably - all on the bike you already own

Shimano GRX ST-RX810-R 11 Speed Right Shift/Brake Lever Orange Seal ZERO LOSS ZERO LOSS simplySHIMANO GRX Hydraulic Disc Brake DUAL CONTROL LEVER 11 speed The SHIMANO GRX DUAL CONTROL LEVER delivers light and responsive shifting for mixed terrain riding. The ergonomic shifter design improves comfort and the textured, anti slip brake lever increases control on bumpy terrain. Greater mixed terrain control Gravel inspired lever and bracket ergonomics Anti slip brake lever Same light shifting operation as top tier road systems