The KSYRIUM Road Wheels S UST Tubeless Front and Rear Set (Shimano Cassette Compatible) The second grade "Xilium S" is a lightweight and durable wheel that is loaded with Mavic technology. The rims are lightweight at 15.2 oz (430 g) and feature four technology to increase rigidity and maintain the upper structure. The hub is similar to Xylium SL ID360 Freewheel Te Approx. 5.5 oz (1,570 g) LF9019100 LR3672100" "New and lightweight tapeless tubeless and road tubeless technologyThe newly renewed KSYRIUM has evolved in weight, rigidity, running and maintenance. Tires that have been included until now are sold separately, and have also been greatly reduced at a lower price. TECHNOLOGY fully sealed upper rim bridge reduces weight while maintaining strength. By removing the nipple hole inside the rim, you can install the tire without the use of rim tape. This allows for smooth and simple tire attachment and removal and light and sharp acceleration due to the lighter weight around the rim, and even the strength of the rim itself. Thin enough to the limits of low stress areas between spokes. It also features ISM4D technology which makes it completely lighter. Nipples are screwed directly from the outside to the rim, which also increases the rigidity of the entire wheel. The inner shape of the rim is also improved, and the groove on the rim center makes it easier to install the tire. In addition, since the hump is eliminated, the tire is much easier to remove. However, the precise design ensures that the tire beads stay in place even under low pressure conditions. There is also an increase in tire types that are compatible with them. Infinity Hab Platform newly designed hub inherits the ID360 synonymous with MAVIC wheels, while providing more rigidity with axles and bearings. The 40 notch freewheel uses a ratchet mechanism that interacts with the face for responsive steps. Freebody can be easily replaced and swapped spokes without removing sprocket or disc rotor. "