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The new Shimano GRX RX400 Flat Mount Brake Calipers are aimed specifically at gravel bikes, giving you a welcome confidence boost to tackle off road and rougher terrain.Excellent heat dissipationFlat mount and anti-mud specificationConvenient tool accessSimple wheel replacementEasy and clean bleeding systemThe GRX caliper offer excellent heat dissipation which means consistent braking power even on the longest or roughest descents. Fitting and maintenance are made simple and easy with convenient tool and an easy and clean bleeding system. Please note that the Rotor and Adaptor are not included.