Optimal surface area Size-specific pro-level concave platform pedal provides optimal shoe/ pedal interface Minimal profile: 11mm-13mm thin Optimal surface area Concave platform for secure foothold Minimal profile 11mm-13mm thin 10 adjustable pins per side for grip Concave platform for secure foothold Premium bearings & seal system 10 adjustable pins per side for grip Serviceable with pedal refresh kit Premium bearings and seal system Small recommended for U.S. menÆs shoe sizes 5-10 Large recommended for U.S. menÆs shoe sizes 10-15 Forged 6061-T6 aluminum body material Forged SCM 435 chromoly steel spindle material Small measures 100mm x 100mm Large measures 114mm x 111mm. PEDAL STAMP 7 SM RED