Black bearing bearing headset 47.8 × 56.8 × 6.5 mm 45° / 45° HB-D21

BLACKBEARING D21 headset bearing – 47.8 × 56.8 × 6.5 mm (45°/45°)

The BLACKBEARING D21 is a high-quality sealed cartridge headset bearing designed for modern bicycle steering systems. Precision manufacturing, low friction, and effective sealing ensure smooth steering performance, precise handling, and long service life.

Key features

• High-quality BLACKBEARING headset bearing
• Sealed cartridge construction
• 45°/45° angular contact design
• Low rolling resistance
• High protection against dust, mud, and moisture
• Chrome steel races and balls
• Precision-ground surfaces for smooth operation
• Durable grease for long-lasting performance
• Designed for modern integrated headset systems

Technical specifications

Compatibility

• Headset systems requiring a 47.8 × 56.8 × 6.5 mm bearing
• 45°/45° angular contact headset standards
• Specific integrated headset systems only
• Always verify exact dimensions and angles before installation, as headset bearings are not universally interchangeable

In practice

• Ideal replacement for worn or damaged headset bearings
• Provides smooth and precise steering feel
• Sealed design protects against contamination
• Durable construction ensures long service life
• Suitable for road, gravel, MTB, and e-bike applications