FSA 1.5" - 1 1/8"  Bike Head Set Crown Race

• A 30mm Alloy Crown RaceTo fit an 1 1/8" Steerer fork in to a 1.5" lower cup assembly with ACB seal bearing, Originally for FSA Headset 55-2
• Outer Diameter 51mm 
• Inner 30mm
• Aluminum 
• Depth 4,7mm
• Shoulder angle 36 degree