Upgrade your bicycle's performance with these premium 6903-2RS ball bearings. Each bearing in this 4-pack features precise dimensions of 17x30x7mm and comes with blue seals for superior protection against dust and moisture. The ABEC-7 precision rating ensures exceptional smoothness and high-speed capability, making these bearings perfect for both front and rear wheel hubs. The 2RS (double-sided rubber seal) design maintains optimal lubrication while keeping debris out, extending the bearing life and maintaining consistent performance. These versatile bearings deliver reduced friction and reliable operation, making them an excellent choice for wheel applications where smooth rolling is essential. The robust construction and precise engineering make these bearings a dependable choice for cyclists who demand quality components. Each bearing is ready for immediate installation and designed to provide consistent, smooth operation across various cycling conditions.