The Blackbearing B5 R4-2RS Bearing 6.35x15.875x4.98mm is designed to deliver enhanced reliability and fluidity for cycling applications. Built to handle the stresses of varied road conditions, it offers long-lasting smoothness and dependable performance for everyday riders.

OEM-Compatible Design: Commonly used as original equipment on many bicycles, this bearing serves as a perfect 100% replacement for your existing setup. Its precise dimensions and high manufacturing standards ensure seamless compatibility and effortless installation.

High-Grade Chrome Steel Construction: Made from SAE52100 chrome steel, the balls and rings provide excellent hardness, wear resistance and strength. The chrome steel cage maintains structural stability, ensuring consistent rotation under demanding use.

Sealed for Protection and Longevity: Equipped with double “2RS” seals, the bearing effectively prevents water, dust and debris from entering. This protection helps retain lubrication, extending service life and maintaining smooth rotation over time.

Pre-lubricated with premium-quality grease, the B5 R4-2RS Bearing guarantees reduced friction and effortless rolling. Designed and assembled with precision, it combines reliability, durability and efficiency for riders who value consistent performance.

Features

• OEM-Compatible Design: Precisely manufactured to match original equipment standards, ensuring seamless fitment and easy installation on most bicycles.
• High-Grade Chrome Steel Construction: SAE52100 chrome steel balls, rings and cage deliver superior hardness, wear resistance and consistent strength.
• Double Sealed Protection: Equipped with 2RS seals that effectively block dust, water and debris while maintaining internal lubrication for extended life.
• Pre-Lubricated for Smooth Rotation: Factory-filled with premium grease to minimize friction and provide effortless rolling under variable road conditions.
• Engineered for Durability: Designed for long-term reliability, combining precision assembly and superior materials for stable, smooth operation.

Specifications

• Product Number: UB-R4-B5
• Seal Type: Double Sealed (2RS)
• Dimensions: 6.35 x 15.88 x 4.98 mm
• Bearing Inner Diameter: 6.35 mm
• Bearing Outer Diameter: 15.88 mm
• Thickness: 4.98 mm