Ceramicspeed bearings 61903-2rsft9h / hc

All CeramicSpeed ​​bearings are handcrafted in Denmark. Super smooth CeramicSpeed ​​grade 3 silicon nitride balls are combined (within microns) with hardened steel raceways featuring an ultra smooth polished groove. The balls are held in place by a reinforced polyamide cage. Each bearing is optimized with a low viscosity CeramicSpeed ​​"Blue Grease" to minimize fiction and increase bearing life. Non-contact seals complete the bearings, preventing dirt and moisture from entering. CeramicSpeed ​​bearings can be used for any cycling discipline: road, TT, Tri, Track, Cross and MTB. The benefits are super low friction, better power transfer, and longer bearing life. During the build process, we check each bearing four times by hand to make sure all parts are a perfect match. CeramicSpeed ​​balls are 400% softer, 128% harder and 58% lighter than standard steel bearings commonly used in the bicycle industry. When comparing CeramicSpeed ​​Balls to other ceramic balls in the industry, you will find that CeramicSpeed ​​Balls are 15% harder, support 99% higher loads and are 100% softer