Black bearing bearing 17 × 30 × 7 mm B5 6903-2RS / 61903-2RS UB-6903-B5

BLACKBEARING B5 6903-2RS / 61903-2RS Bearing – 17 × 30 × 7 mm

EAN: 3760290192256
SKU: UB-6903-B5
Brand: BLACKBEARING
Type: Deep Groove Ball Bearing (2RS)

The UB-6903-B5 is a premium-quality deep groove ball bearing designed for cycling and precision mechanical applications. The 6903-2RS and 61903-2RS designations refer to the same bearing size: 17 × 30 × 7 mm. The BLACKBEARING B5 series provides excellent rolling performance, low friction, and long service life while offering effective protection against water, dust, and other contaminants.

The bearing is manufactured with SAE52100 chrome steel balls (ABEC 5), precision-machined steel rings with accurate raceways, a chrome-plated steel cage, reinforced 2RS seals, and premium-quality lubricant, ensuring reliable operation even under intensive cycling conditions.

The reinforced 2RS seals effectively protect the internal bearing components from water and contamination while keeping the lubricant inside the bearing for smooth and consistent performance.

Key Features

• Premium BLACKBEARING B5 quality
• 6903-2RS / 61903-2RS standard
• Double rubber seals (2RS)
• Low rolling resistance
• Effective protection against dust and moisture
• Precision manufacturing and assembly
• SAE52100 chrome steel balls (ABEC 5)
• SAE52100 chrome steel rings with precision raceways
• Chrome-plated steel cage
• Filled with high-quality lubricant
• Long service life and reliable operation
• Reinforced 2RS seals for enhanced water and dust resistance

Technical Specifications

Applications

• Wheel hubs
• Bottom bracket systems
• Pedals
• Suspension pivot points
• Derailleur pulleys
• Other precision rotating components

In Practice

The UB-6903-B5 is an excellent choice for applications where compact dimensions, durability, and reliable performance are essential. The double 2RS sealing system effectively protects the internal components from water and contamination while maintaining the lubricant inside the bearing.

Precision manufacturing, high-quality SAE52100 steel components, and ABEC 5 grade balls ensure smooth, quiet, and reliable operation even under intensive cycling conditions.