Shimano R171 Road Shoes. The Shimano R171 is a full featured road shoe that delivers both competition level performance and optimal, all day comfort in a lightweight, well crafted package. Stiffness abounds courtesy of the carbon fiber composite sole that provides a rock solid, yet lightweight, platform for transferring your wattage output into powerful pedal strokes. The shoe's upper is a sleek and supple synthetic leather with a mesh panel for breathability. The R171's retention system features a ratcheting buckle that can be adjusted for optimal ergonomics coupled with a pair of asymmetric Velcro straps that eliminate pressure points. Additionally, the shoe features Shimano's innovative Surround Upper that better encases the foot for optimal holding power as well as a superb level of comfort. And while this shoe works with any 3 bolt cleat road pedal, it's optimized to seamlessly integrate with Shimano's PD 6800 pedal to maximize performance with a seamless pedal and cleat interface.