{"product_id":"ceramicspeed-cartridge-bearings-cartridge-bearing-mountain-bike-road-bike-bb9903","title":"CeramicSpeed 61903 (6903) Ceramic Bearings - Grade 3 Silicon Nitride Balls, Low-Friction, High-Performance Cycling Component for Road, MTB, Triathlon","description":"\u003cdiv id=\"seqbpdescription-1\"\u003e\u003cp\u003eUpgrade your cycling performance with the CeramicSpeed 61903 (6903) Ceramic Bearing - the pinnacle of precision engineering designed for serious cyclists across all disciplines. Hand-built in Denmark, this high-performance bicycle bearing combines advanced materials, innovative technology, and expert craftsmanship to deliver unmatched smoothness, durability, and efficiency.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-2\"\u003e\u003cp\u003eMaterials \u0026amp; Construction:\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-3\"\u003e\u003cp\u003eCrafted with Grade 3 Silicon Nitride ceramic balls, these bearings offer a dramatic improvement in hardness, weight, and smoothness over traditional steel bearings. The resilient, hardened steel raceways are precision-machined with ultra-smooth polished grooves, ensuring optimal contact and minimal friction. Reinforced polyamide cages securely hold the ceramic balls in position, contributing to overall reliability and longevity. Non-contact seals effectively protect against dirt and moisture, making these bearings suitable for all cycling environments - road, triathlon, time trial, track, cyclocross, and mountain biking.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-4\"\u003e\u003cp\u003ePerformance \u0026amp; Engineering:\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-5\"\u003e\u003cp\u003eCeramicSpeed's use of 100% silicon nitride balls results in bearings that are 400% smoother, 128% harder, and 58% lighter than standard steel counterparts. This translates into reduced rolling resistance, improved power transfer, and enhanced efficiency during every pedal stroke. The bearings are pre-lubricated with CeramicSpeed's proprietary Blue Grease, a low-viscosity lubricant engineered to minimize friction and extend bearing life, ensuring optimal performance in even the most demanding conditions.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-6\"\u003e\u003cp\u003eInnovative Features \u0026amp; Technology:\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-7\"\u003e\u003cp\u003e- Grade 3 Silicon Nitride Balls: Superior hardness and smoothness for reduced friction and increased durability\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-8\"\u003e\u003cp\u003e- Hardened Steel Races: Precision-machined for consistent performance and longevity\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-9\"\u003e\u003cp\u003e- Reinforced Polyamide Cage \u0026amp; Non-Contact Seal: Protects against dirt, water, and debris, ensuring reliable operation across all cycling disciplines\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-10\"\u003e\u003cp\u003e- Pre-Lubricated with Blue Grease : Minimizes friction and extends bearing lifespan\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-11\"\u003e\u003cp\u003e- Versatile Use: Suitable for hubs, bottom brackets, headsets, and wheel bearings in road, triathlon, track, cyclocross, and MTB applications\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-12\"\u003e\u003cp\u003eStyle \u0026amp; Use Case:\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-13\"\u003e\u003cp\u003eDesigned for cyclists seeking maximum efficiency and durability, this bearing is ideal for upgrading existing wheelsets, hubs, or bottom brackets. Its sleek design and top-tier materials serve both functional performance and aesthetic appeal, catering to competitive racers and passionate riders alike.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-14\"\u003e\u003cp\u003eSpecifications:\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-15\"\u003e\u003cp\u003e- Inner Diameter: 17mm\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-16\"\u003e\u003cp\u003e- Outer Diameter: 30mm\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-17\"\u003e\u003cp\u003e- Width: 7mm\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-18\"\u003e\u003cp\u003e- Part Number: 61903 (6903)\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-19\"\u003e\u003cp\u003e- Material: Ceramic (Silicon Nitride Balls)\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-20\"\u003e\u003cp\u003eMaximize your riding potential with the CeramicSpeed 61903 (6903) Ceramic Bearing - engineered for superior speed, smoothness, and reliability. Whether you're chasing podiums or enjoying leisurely rides, experience the difference that advanced ceramic technology and expert craftsmanship bring to your bicycle.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpfeatures\"\u003e\u003cul\u003e\n\u003cli\u003eHigh-performance ceramic bearing engineered with Grade 3 Silicon Nitride balls for superior smoothness, hardness, and longevity. \u003c\/li\u003e\n\u003cli\u003eHand-built in Denmark to ensure precise craftsmanship, featuring hardened steel raceways and ultra-polished grooves for optimal performance. \u003c\/li\u003e\n\u003cli\u003eAdvanced sealing system with non-contact seals effectively keeps dirt, moisture, and debris out, minimizing maintenance and maximizing bearing life. \u003c\/li\u003e\n\u003cli\u003eDesigned for versatility across all cycling disciplines-including Road, TT, Triathlon, Track, Cyclocross, and MTB-offering exceptional power transfer and reduced friction. \u003c\/li\u003e\n\u003cli\u003eUtilizes CeramicSpeed's proprietary Blue Grease technology, providing low viscosity lubrication that boosts efficiency, reduces wear, and extends bearing durability.\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/div\u003e","brand":"CeramicSpeed","offers":[{"title":"Default Title","offer_id":42206675304515,"sku":"BB9903","price":116.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1608\/6187\/files\/BB9903.jpg?v=1773356441","url":"https:\/\/365cycles.com\/products\/ceramicspeed-cartridge-bearings-cartridge-bearing-mountain-bike-road-bike-bb9903","provider":"365 Cycles","version":"1.0","type":"link"}