Shimano SH-XC51N Mountain Bike Shoes - Performance Exclusive. Built for XC racing performance, the Shimano SH-XC51 Mountain Bike Shoes provide all-season comfort and have a low-profile armored upper for impact protection. Shimano Dynalast gives you a precise fit and improves pedaling efficiency. Mud-shedding polyurethane outsole lugs increase traction on the run-ups and hike-a-bike sections. Rigid fiberglass-reinforced sole offers excellent power transfer and tough synthetic leather upper won't stretch out. Dual offset straps, plus a micro-adjust buckle give a precise, pressure-free fit. Includes spike mounts for extra grip in wet conditions.