Stack Height: Pedal only: 8.7 mm / Pedal with cleat: 9.7 mm Q-Factor: 54 mm Body Material: Anodised aluminium Spindle: Hardened steel with powder-coated surface Bearings and Seals: PA6 with 20 percent glass fibre Weight: 254 g Please note: The SRM X-Power pedals are only compatible with the Q36.5 Unique Pro 4.0 Shoes and are designed to work as an integrated system.