Trp Spyre Slc, Road Mechanical Disc Brake, Front Or Rear, Post Mount, 140 Or 160Mm (Not Included), 170G, Silver* A mechanical two piston disc brake for road levers* Two piston movement evenly contacts rotors for optimum braking powerand modulation* Robust carbon fiber actuation arms engage both pistons evenly* Ramped ball bearings offer smooth pad engagement and precisemodulation* Integrated cable barrel adjusters* 146g (rotor weight not included)