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DirtySixer® Bikes USA The Biggest Bikes for the Tallest Riders The DirtySixer® are the only big 36er bikes specifically designed, engineered in the USA, for tall riders, by tall riders. New line coming up with sizes from XL up to 5XL! Building a community of tall riders on big high-quality DirtySixer bicycles! DirtySixer® is the only bicycle company endorsed by the NBRPA (National Basketball Retired Player Association).