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Outside Width: 4in (102mm)
and others
That's a fancy way of saying XW-Ring seals make your chain last longer
It protects against wear and oxidation
RK 520XRU UW-Ring Chain - Gold (120L) Type_Brake Fluid Outside Width: 4in (102mm)520XRU was designed for professional MotoGP racing. Featuring UW Ring seals, XRU is a lightweight professional racing chain. The UW seals reduce friction while maintaining optimal horsepower delivery from the start of the race to the end. Developed in collaboration with MotoGP and World Superbike teams to produce the ultimate racing chain. Specifications: Tensi le Strength: 9,000 lbs (4082kg) MAX CC Rating: 1,000cc MAX Horsepower: 265 HP Weight: 3. 46