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Designed to perform on the streets, the velodrome, and everywhere in between, the affordable Pure Fix Keirin double-butted 6061 aluminum frameset is ready to take you to the next level of riding. Pure Cycles offers two options -- the Keirin and Keirin Pro -- that are ideal for riders who got hooked on fixed bicycling with their first Pure Fix fixie. The Keirin frameset with double-butted 6061 aluminum tubing is designed to give you the edge on the track and the streets. Featuring an integrated headset and smooth welds it's light, stiff, responsive, and ready for anything from a criterium to a commute. This frame also has an aerodynamically improved fork, hydroformed top tube and seat tube, 31.8mm seat post clamp, and 68mm English threaded bottom bracket. Both the Keirin and Keirin Pro are available in five sizes -- 49cm, 52cm, 55cm, 58cm, and61 cm-- with a weight range of 4 pounds, 8 ounces to 5 pounds 4 ounces. Celebrating bicycling for all that it offers, Pure Cycles offers a variety of frame, geometry, and gearing options as well as a cornucopia of compatible accessories, including different styles of handlebars, saddles, water bottle cages, foot straps, and more.