FSA 55R-1 semi-integrated headset

Semi-integrated headset 1.5 No.55R-1 with 1-1/8 reducer - black alloy

Semi-integrated head assembly with duralumin CNC machined cups designed for head tube frames
- top: with inner diameter 55mm/outer diameter 61mm
- bottom: with inner diameter 55mm/outer diameter 61mm and 1-1/8 fork post.

FSA TH-073E, 36°x45° Angular Contact Ball bearings (ACB - Angular Contact Ball bearings) have high running accuracy, which is ensured thanks to an optimized internal structure that allows capturing simultaneously acting radial and axial loads.

The height of the upper cover is 5 mm.
Height of the head assembly outside the frame (stack height): 11mm
The package contains the FSA hedgehog for the metal fork post.
Weight 100g.