Shimano S-Phyre SH-RC903 Road Cycling Shoes
Built for all-out speed, the S-Phyre RC903 pairs a stiff carbon sole with a refined, wraparound upper for pro-level efficiency and control. Dual BOA® Li2 dials deliver precise micro-adjustments, while the anti-twist stabilizing heel cup locks your foot in place during hard sprints. A lightweight microfiber synthetic leather upper with targeted perforations boosts breathability, and Shimano DYNALAST shaping helps reduce fatigue on long rides.
Key Features
- Dual BOA® Li2 dials for low-profile, bi-directional micro-adjustability
- Anti-twist stabilizing heel cup keeps the heel planted under high torque
- 360° surround-wrap upper (microfiber synthetic leather) for glove-like fit
- Ultra-stiff carbon sole for maximum power transfer
- Ventilated upper & toe ports for airflow and temperature control
- DYNALAST toe-spring profile to help reduce fatigue over distance
- Replaceable heel pad and durable reinforced toe
Specs
| Intended Use | Road racing / performance |
| Upper | Microfiber synthetic leather with targeted perforations |
| Closure | Dual BOA® Li2 dials + lace guides |
| Outsole | Full carbon (ultra-stiff) |
| Cleat Compatibility | 3-bolt road (SPD-SL) only |
| Heel Cup | Anti-twist stabilizing structure |
| Weight | Approx. mid-200 g per shoe (size-dependent) |
Fit tip: RC903 has a close, race-oriented fit. For higher volume feet, consider the RC903 Wide variant. (SPD-SL 3-bolt only.)