World-Class Road Racing Performance Shoe When every watt matters and every adjustment counts, the all-new S-PHYRE SH-RC910 shoe represents the next evolution of SHIMANO’s flagship road racing shoe. Engineered as a complete pedaling system alongside the new SPD-SLR pedal platform, the shoe is designed for the world’s fastest riders and refined through extensive WorldTour feedback. The S-PHYRE RC910 delivers exceptional power transfer, an even more precise fit, and the lowest stack height Shimano has ever produced. FEATURES: Ultimate Pedaling Efficiency: New carbon hollow core sole creates Shimano’s lowest stack height ever for maximum pedaling efficiency. Precision Fit: Premium Japanese microfiber upper delivers lightweight, breathable, and a seamless race-ready fit. Race-Proven Comfort: SHIMANO DYNALAST 2.0 provides an improved fit with wider forefoot and reduced toe spring for long-ride comfort. Stability Under Max Power : Reinforced carbon heel structure minimizes twisting for maximum stability during high-power efforts. SPD-SLR Adjustability : Extended SPD-SLR cleat adjustment range allows riders to fine-tune their optimal pedaling position. Secure and Adjustable Fit: Dual BOA® Li2F dials with textile laces provide precise micro-adjustments and secure wrap around the foot.