GRX ST-RX400 Shifter/Brake SetDescription The Shimano GRX RX400 Hydraulic Disc Brake Set is a pre assembled J Kit brake package built for gravel and mixed terrain drop bar bikes. Each kit pairs a Shimano GRX ST RX400 hydraulic brake and shift lever with a Shimano GRX BR RX400 hydraulic disc brake caliper for consistent control on rough surfaces. This system is designed for 2x10 speed drivetrains, combining hydraulic braking with mechanical 10 speed shifting. GRX RX400 levers use
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