BLACK BEARING 45°/45° Headset Bearing 40x52x12 mm HB-D4

Designed for a bicycle steering column, which is the mechanism that allows the fork and handlebars to rotate smoothly.

Features:

• 2RS seals: Labyrinth seals with double lip of last generation. Better resistance to water and dust, combined with low friction.
• Ground raceways for better fluidity and longer life.
• Superior quality lubricant.
• High quality of marbles, label abec 5.
• Maintains balls by metal cage.

Dimensions:

• Inner diameter 40 mm. 
• Outer diameter 52 mm. 
• Width 12 mm. 
• Angle 45°/45°.