FSA Micro ACB 1-1/8″ Headset Bearing – Gray-Sealed Durability for Precision Steering

Tired of gritty steering or premature bearing wear? The FSA Micro ACB 1-1/8″ Headset Bearing combines stainless steel durability with a patented gray silicone seal to deliver silent, smooth performance in wet, dusty, or high-stress conditions. Engineered for 36x45mm fork steerers (standard 1-1/8″), it replaces worn OEM components while reducing maintenance—no greasing or cleaning needed between rides.

Key Benefits:
✅ Corrosion Resistance: Stainless steel core outlasts standard steel bearings in salty/muddy environments
✅ Full Contamination Protection: Double-lip silicone seal exceeds JIS standards for particle/water resistance
✅ Low Friction Design: Maintains consistent preload tolerance (-0.005″/+0.010″) for years of service

Competitive Edge:
| Feature | FSA Micro ACB | Standard Bearings |
|————————-|————————-|————————-|
| Seal Type | Dual-lip silicone | Basic rubber |
| Material Hardness | HRC 58-60 | HRC 50-55 |
| Weight Savings | 15% lighter | N/A |
| Maintenance-Free Period | 12+ months | 3-6 months |

Ideal for CX racers needing predictable handling in mud or commuters battling road grime, this bearing maintains +/-0.001″ concentricity even after thousands of miles—outperforming generic replacements by up to 3x in service life tests*.

*Based on FSA internal durability testing vs ABEC 3 steel bearings in mixed terrain conditions