Shimano 8170 Di2 Rh Sti W Bk Food & Game Preparation It features two button flap Gear Ratio:3.8:1 2.0:1 It features two button flap chest pockets Small studs mounted on each side of the knife blade allow for easy Features The wireless connection provides a clean cockpit enhancing the aerodynamic effect and easy maintenance Wider pad clearance decreases brake noise Maintenance friendly bleeding process Unparalelled ergonomic features such as raised hood peaks on levers Brake control is optimized with light and smooth lever action Enhanced modulation thanks to an expanded braking control area Compatible with wireless or wired connection Ultegra ST R8170 brake levers bring enhanced modulation and control to every ride by employing Shimano s proven SERVO WAVE technology