This is fine set of high-flange track hubs made by Dia-Compe in Taiwan featuring smoooooth sealed cartridge bearings. The rear is flip flop in the fixed/fixed variety with an axle spaced to 120mm you set up with a 42mm chain line. They weighing in at 604g for the pair.<br /><br /><strong>Useful information for the Wheel Builder…</strong><br /><br />Front:<br />34.5mm Flange Width<br />62.3mm Flange Diameter<br /><br />Rear:<br />32mm Flange Width<br />62.3mm Flange Diameter