Ideal for owners of compatible Specialized Tarmac SL7, Tarmac SL8 or Venge road bikes replacing a worn headset bearing with a correctly measured, individually supplied component.
The BlackBearing D15 is a single replacement headset bearing for compatible Specialized road bikes. Its 40.5 mm internal diameter, 49.5 mm external diameter and 6.5 mm height match the bearing size used across listed Tarmac SL7, Tarmac SL8 and Venge applications, with a 45/45° interface for the headset’s bearing seats.
Inside, the oblique-contact design is suited to the loads generated through a bicycle’s steering system, helping the front end turn smoothly when the original bearing has become rough, noisy or notchy. Chrome-steel SAE52100 balls and rings provide a durable replacement construction, while dedicated headset-bearing seals help limit contamination during everyday riding.
This is a practical choice when you need the correct bearing without replacing the complete headset. Check the dimensions and frame model carefully before ordering: Specialized model fit varies, and internally routed brake hoses can make headset-bearing replacement a substantial workshop job. On compatible internally routed frames, professional installation may be worthwhile, particularly if hoses need to be disconnected and the brakes bled.
Correct Specialized road-bike size
The 40.5 × 49.5 × 6.5 mm format is listed for compatible Tarmac SL7, Tarmac SL8 and Venge headset applications.
45/45° interface
The matching contact angle is designed to seat correctly in the corresponding headset bearing positions.
Oblique-contact design
Angled bearing geometry is made for the steering loads experienced at the front of a bicycle.
Chrome-steel construction
SAE52100 chrome-steel balls and rings provide a robust replacement bearing specification.
Headset-specific seals
Dedicated seals help protect the bearing from everyday riding contamination.
Pre-lubricated
High-quality grease is specified for smooth, ready-to-install headset bearing operation.
Sold individually
Order the number of bearings required for your service rather than buying a complete headset assembly.
Workshop-friendly replacement
A direct bearing replacement can avoid changing the complete headset, although internally routed systems may require hose disconnection and brake bleeding.
General
Dimensions and geometry
Materials and construction
Oblique-contact bearing
The angled bearing design is made for headset steering applications, helping the bearing handle the loads generated through the front end of the bike.
Specific headset-bearing seals
Dedicated seals help protect the bearing from contamination in everyday cycling conditions.
SAE52100 chrome-steel construction
Chrome-steel balls and rings provide a durable bearing construction for headset replacement use.
BlackBearing is a French supplier of bearings and components for sport activities, with a particular focus on cycling. The company was founded by Garlan and Youenn, whose backgrounds in cycling, mechanics, industry and trade shaped its focus on application-specific mechanical components.
The brand first became known in France before expanding across Europe and other markets. Its cycling range serves both original-equipment and aftermarket applications and includes bearings and other bike components developed through material selection and field testing.
