Enduro Bearings ACB S8551 BO ABEC 5 Angular Contact Headset Bearing (36.8 x 45.8 x 6.5mm)
The Enduro Bearings ACB S8551 BO is a high-precision ABEC 5 angular contact headset bearing designed to deliver exceptional steering smoothness, durability, and load capacity. Purpose-built for bicycle headset applications, this premium bearing is ideal for road bikes, gravel bikes, mountain bikes, and e-bikes where reliability and precision are critical.
Featuring a 45° x 45° angular contact design, this bearing distributes loads evenly across all ball bearings, unlike standard radial bearings that concentrate stress on the lower race. The result is significantly extended bearing life, reduced wear, and consistent performance, keeping you riding longer and servicing less.
Manufactured to ABEC 5 tolerances with Grade 5 balls, the ACB S8551 BO offers smoother rotation and more precise steering control than lower-grade alternatives. LLB dual-lip seals provide excellent protection against dirt and moisture, while Kyodo Yushi PS-2 grease ensures long-lasting lubrication, low friction, and dependable performance in all riding conditions.
- High-precision angular contact headset bearing
- 45° x 45° contact angle for optimal load distribution
- ABEC 5 rated for superior smoothness and accuracy
- Grade 5 ball bearings for reduced friction and wear
- LLB sealed to protect against contamination
- Pre-lubricated with Kyodo Yushi PS-2 grease
- Ideal replacement bearing for bicycle headsets