bsd substance crank 165mm flat blackBSD Substance cranks are durable BMX cranks made of hardened Cr Mo steel, designed for street, park, trail, and flatland riding. Their innovative 2. 5 piece design and hollow spindle ensure stiffness, durability, and low weight. Product description: The Substance BSD cranks are crafted from hardened Cr Mo steel with box section crank arms for increased stiffness and durability. The 22mm hollow axle is both strong and lightweight, and the 48 spline
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