Bearing balls are manufactured to a specific grade, which defines its geometric tolerances (or roundness). The smaller the number the higher the precision. A grade 20 ball for instance is 20/1,000,000" out of round. Enduro use Grade 10 for ABEC 3. Finance is subject to application, financial circumstances and borrowing history. Performance Cycling Limited FRN: 720557 trading as Tredz are authorised and regulated by the Financial Conduct Authority. We are a credit broker not a lender – credit is subject to status and affordability and is provided by Mitsubishi HC Capital UK PLC. Terms & Conditions Apply. For road racing, NTN LLB series, SKF RZ series and NSK VV series are recommended. For inclement weather or extended life, NTN LLU series, SKF 2RS series, NSK DD series or FAG 2RS series are recommended

Literally means the bearing has Two Rubber Seals. There are many types of seals. On most other bearings 2RS means that the seal is made from rubber and has one sealing lip rubbing on any flat part of the inner race. Enduro’s seals are usually either LLU (usually the MAX type bearings) or LLB (better for hubs). This bearing is often labelled as 6903 by DT SWISS, an ISO 6903 bearing has 17mm bore, this item has an 18mm bore.Jinan Maolei Bearing co.,Ltd is a product and trade integrated company specializing in bearings.We have more than twenty years' experence in technical support and service provided for bearings in industrial field. We have our own factory, which is located in China's bearing production base--Shandong province. Covering more than 3000 square meters, the factory possesses many pieces of advanced manufacturing equipment. We have about 300 staffs, 20 technicians and 20 quality controllers. Unlike others, Enduro bearings are not just ‘off the shelf’ Industrial bearings. They are tailored specifically for the demands of cycling. Every aspect of an Enduro bearing is considered and spec’d to provide superior performance and value for each application. From the material of the races and theball bearings, the types of seal and even the grease. Each of these has a profoundeffect of the performance and longevity of a bearing. The ABEC grade of bearings is a set of standards for the manufacturing tolerances of bearings. There are five classes from largest to smallest tolerances: 1, 3, 5, 7, and 9. The higher ABEC classes provide better precision, efficiency and greater speed capabilities, but do not necessarily make the components spin faster. All quality manufacturers around the world manufacture to at least ABEC 1 standard. Enduro’s Minimum Standard is ABEC 3. A: Yes, before shipment products will be strictly inspection on our factory QC Process System.We have a professional QC team.

Bearings are of standardised dimensions. In your case 6902 is 15 x 28 x 7 (inner diameter x outer diameter x width) and 6903 is 17 x 30 x 7 (which you probably got from Google). bearing high speed bicycle hub bearing is the most representative and widely used bearing. It can withstand axial loads in both directions, in addition to radial loads, even at high speed. They are available for low noise and low vibration.Bearings with mental shields and rubber seals are pre-lubrecated by some grease. Deep groove ball bearings with filling slots have the same dimensions with the standard ones. Filling slot bearings have a higher radial load carrying capacity than bearings without filling slots.