The S-PHYRE RC903 PWR cycling shoes are designed for track racers, sprinters, and time trial specialists, offering professional-level power transfer in a sleek, attractive design. The slim BOA® Li2 metal dial closure and the shimmering crystal finish on the outsole and heel area create a spectacular synthesis of performance and style. Behind the scenes, the low profile, heel cap with anti-twist stabilization, and breathable, stretchable upper material set new standards for fit, stability, and lightness.

• The closure system tailored for racing features a sophisticated BOA® Li2 metal dial, Powerboost wire routing, and toe strap, reducing foot movement and optimizing power transfer.
• The breathable and stretch-resistant upper material ensures optimal power transfer and an excellent fit.
• Heel cap with anti-twist protection for optimal foot positioning during strong acceleration and high cadence.
• The flat midsole stabilizes the foot and optimizes power transfer.
• Integrated seamless midsole and upper construction for unparalleled fit, stability, and lightness.

SPD System: SPD-SL is a pedal/shoe system for road bikes, developed by SHIMANO with a focus on optimal power transfer. The particularly wide, low-profile plate distributes pressure more evenly over a larger surface area and efficiently transfers power to the pedal, even under extreme load. Designed as a system, Rider Tuned, for more endurance on long distances. More comfort and fun!.