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Listen up all triathletes and time trialers that are using 650c wheels. Special ultralight design for faster acceleration and improved road feel. Made from 2 different silicium-based compounds to optimize rolling resistance, wear and grip. 127 tpi casing with special puncture resistant belt. Kevlar folding bead. Black center tread, dark gray side tread, black sidewall. 650x23c / 215g.