DT Swiss FR 541 Alloy Rim (Downhill)21mm deep, tubeless ready, disc specific rim Burly rim with a wide platform to handle the entire mountain A nearly seamless welding process and a special anodizing treatment boosts strength while remaining durable DT Swiss patented Pro Head Reinforcement System (PHR System) is designed to balance the load transferred to the rim, working as a ball and socket interface, requiring unique washers and Squorx nipples Rims include Squorx nipples and washers