FSA Xtreme Pro Headset Half EC 1.5" 49.6mm Lower (EC49/40)

For 49.6mm ID head tube For 1.5" tapered fork Lower: Alloy cups with 1.5", 36x45° aCB Weight: 78.3g

FSA Xtreme Pro Headset Half EC 1.5" 44.0mm Lower (ZS44/40)

For 44mm ID head tube For 1.5" tapered fork Lower: 1.5", 36x45° ACB Weight: 78.7g

FSA Xtreme Pro Headset Half IS 1.25" 47.0mm Lower (IS49)

For 47.0mm ID head tube For 1.25" tapered fork Lower: 1.25", 45x45° ACB Weight: 34.8g

FSA Xtreme Pro Headset Half IS 1.1/8" 42.0mm Upper (IS42/28.6)

For 42.0mm ID head tube For 1.1/8" tapered fork Alloy top cover 45x45° ACB Weight: 60g

FSA Xtreme Pro Headset Half IS 1.1/8" 42.0mm Lower (IS42/30)

For 42.0mm ID head tube For 1.1/8" tapered fork 45x45° ACB Weight: 34.7g

FSA Headset Bearing ACB 8C-138 1.3/8" 48.9mm 45°×45° MR151

Outside Diameter: 48.9mm Inside Diameter: 37.0mm Height: 7.0mm Inside Angle: 45° Outside Angle: 45° TH Code: MR151