Track hub set ABRUZZO hub Track full black ; double thread: Thought and created for circuit competitions. Hubs Trabocchi machines these components from 71-millimeter round bars in 6061 aluminum, the shells of the hub track hubs undergo four different machining processes before they are finished. As a result of our fixie track hubs, they are machined in double brilliant polish, subjected to an anodizing process in brilliant black. With shielded and sealed ball bearings in 6000ZZ, which provides lightness and smoothness when turning. The position of the bearing of the bearing modifies more to the center of the casing with a greater thickness in its conception, a smaller center in its diameter (than the Madison model) and flanges more separated to achieve a more rigid wheel once assembled Steel axle 1045 with 15 openwork hexagonal nut adjustment that achieves the same performance but with less weight. .Front: flange diameter 70 mm, opening between tips 100mm. Rear flange diameter 70 mm, opening between chainstays 120mm, freewheel threading diameter 35mm x 24 TPI, . Sprocket thread diameter 14 or 15 free teeth 30 millimeters x 26 TPI