B543 2RS 397508 2RS 1010914 2RS Bicycle Ball Bearing

The B543 2RS and 397508 2RS are actually the same type of bicycle headset bearing (size 39.7×50.8×7.14mm), adopting high-carbon chromium alloy steel races paired with grade 10 steel balls, matched with a nylon cage and double-sided lip seals, filled with waterproof grease to resist sweat and impurities, featuring an angular contact structure that can evenly distribute forces; the 1010914 2RS is also a bicycle-specific ball bearing with double-sided rubber seals. All three are suitable for bicycle steering parts and can extend the service life of bearings in riding scenarios.

Technical parameter:

B543 2RS and 397508 2RS adopt a compact single - row angular contact structure with dimensions of 39.7×50.8×7.14mm. Their inner and outer rings are made of GCr15 chrome steel through a vacuum degassing process, with a hardness of 59 - 63HRC, and the raceways are mirror - polished. Some models have no cages to accommodate the maximum number of steel balls, increasing load capacity by 35 - 40%, while others are equipped with nylon or copper cages to stably separate the steel balls. They are equipped with double - sided nitrile rubber double - lip seals, whose sealing lips fit into micro - grooves to form a labyrinth - type protection, and the interior is filled with 90% high - pressure waterproof grease. The deeper - designed raceways can provide sufficient lateral support for the torsional force during bicycle steering, adapting to the force requirements of the front - end steering parts. The 1010914 2RS is also a bicycle - specific ball bearing with double - sided rubber seals, and its structure is suitable for the installation and force - bearing scenarios of bicycle steering components, ensuring stable operation during riding.