The ABEC5 61803 SRS has been engineered to provide superior performance and value which is unrivaled in comparison to standard off-the-shelf bearings. Developed especially for cycling, this high-quality model boasts two rubber NBR SRS 70 seals with an axial face seal that features a large contact surface area, making it perfect for very smooth and free running. Thanks to its Kyodo Yushi PS-2 grease, this bearing benefits from high-speed properties and minimum rolling resistance.