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Surly’s Ultra New Fixed Singlespeed Hubs are new even though they look like the old hubs. The differences are noticeable when you look past the aluminum 6061-T6 forged and machined alumninum shell. Inside the Surly Ultra New Hub is a new hollow axle that very easily converts from a bolt-on to quick release axle. The fixed gear is ideal for track bikes. All Ultra New hubs come with fixing bolts, but all are QR compatible without axle conversion or any other extra stuff. Surly’s Ultra New axles are made of Chromoly steel with 10.9 stainless steel fixing bolts. The Surly Ultra New Hubs are offered in different widths for different applications.