Black bearing bearing headset 40 × 51.8 × 7.5 mm 36° / 45° HB-D25

BLACKBEARING D25 headset bearing – 40 × 51.8 × 7.5 mm (36°/45°)

The BLACKBEARING D25 is a high-quality sealed cartridge headset bearing designed for modern bicycle steering systems. Precision manufacturing, low friction, and effective sealing provide smooth steering performance, accurate handling, and long-lasting durability.

Key features

• High-quality BLACKBEARING headset bearing
• Sealed cartridge construction
• 36°/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 extended service life
• Designed for modern integrated headset systems

Technical specifications

Compatibility

• Headset systems requiring a 40 × 51.8 × 7.5 mm bearing
• 36°/45° angular contact headset standards
• Specific integrated headset systems only
• Always verify exact dimensions and contact 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