A rim that is lightweight yet as wide as those of a few years ago? State-of-the-art materials and numerous tests make it possible. DT Swiss knows exactly how to design a lightweight product that is meant to accomplish its goal. That's why the XM 421 is as light as a mountain outline while still being unafraid of terrain no matter what rocky trails are on the menu. Tubeless Compatible - These rims can be converted for tubeless tires using the Tubeless SBWT welded kit - two special inserts, pressed at both ends, ensure that the rim profile is stabilized during the welding stage. The final correction of the weld is done on the machining center. XM (Cross Mountain) - a group of components for riders who want to do everything. Climbing the Alps, a weekend on the bike with a group of friends or participating in a bike marathon - versatility and reliability are as important as weight and comfort. Weight: 27.5'' - 440 grams 29" - 465 grams