1 PC 6903-2RS CB Hybrid Ceramic Bearing 17x30x7 mm ABEC-1 Bicycle Bottom Brackets & Spares 6903RS Si3N4 Ball Bearings

Bearing Kits61903 2RS ABEC-3QTY: 1pcs Dimension: ID=17mm, OD=30mm, W=7mm Chrome Steel,BLAKC Rubber Seals ,Greased, ABEC-3 (ISO P6) Marking: Neutral Package: Vacuum plastic bags and envelope As for bicycle bearings, at present we can provide three kinds of quality, as follows:Ordinary A class: the material, appearance and size are basically the same as the bearings, but the products that fail to the [ grade] standard in the production and testing process and are downgraded, the bearing's matching precision, rotation flexibility and service life are worse, which are suitable for the use of the general low-grade bicycles and the maintenance department of the car shop.High-qualityB class: bearing inner and outer rings and steel ball are made of "bearing steel" material, and the hardness is HRA62 degrees, which is much higher than that of ordinary bearings. Special grease for high-strength bearings is added inside, which has the advantages of high fitting precision, good rotation flexibility, small friction and long service life (customers actually use it in more than 50,000 kilometers). Professional supporting various kinds of high-grade bicycle shaft. (This type of bearing is specially for customers, in line with EU standards, long-term supporting exports to Europe, America and market) C class: On a B-level basis, ceramic balls and nylon retainers are used, or all ceramic is used. speed and acceleration capacity, can be operated under the condition of Du value more than 3 million, and skid, wear and heat can be reduced. Long life and wear resistance.The fatigue life of all-ceramic bearings is 10-50 times longer than that of all-steel bearings, and the life of mixed ceramic bearings is about 3-5 times longer than that of all-steel bearings. The required lubrication is very little, and the friction of ceramic materials is low. The lubrication ability of ceramic bearings with lubrication is not lower than that of trad

• Bearing Kits
• 1 PC 6903-2RS CB Hybrid Ceramic Bearing 17x30x7 mm ABEC-1 Bicycle Bottom Brackets & Spares 6903RS Si3N4 Ball Bearings