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Who said hydraulic disc brakes were the end of cross top brake levers Shimano's new GRX BL-RX812 Sub Brake Levers bring the security and control for mixed terrain riding. Quickly brake when riding on the topsGives gravel or cross bikes multiple brake optionsLess hand fatigue on longer ridesThe Sub Levers offer reliable and accessible braking in more positions and allows for quick and powerful braking while riding upright on the tops of the handlebar, giving you less fatigue and more options when braking.