Tuned stiffness characteristics for optimum ride feel. 1K outer fabric has greater abrasion resistance and a unique aesthetic. Replaceable pedal thread insert. Foam core helps to absorb impacts and dampen vibrations. Proven self-extracting axle/arm interface, inherited from Evo cranks. 30mm oversized 7075 aluminum axle. Weight: from 422g (arms, axle and 34 tooth spiderless ring)