EX 511: for the fastest EWS racers, a 30 mm welded enduro rim. Enduro may still be a young discipline, but at heart riders have an irresistible urge to tackle demanding terrain faster and faster. It's the very essence of mountain biking since its beginnings. The EX 511 rim is the ideal partner for that pursuit: a technology-packed rim with several EWS wins to its name, in a 30 mm wide profile. Ride harder, ride faster.