Recently bought a 1991? Alpinestars Cro Mega that's got a rare 1 1/4 inch threaded headset. This adapter was used to go with a regular 1 1/8 inch ahead stem. The upper
Headset Claw Star Nut 1" Ahead
FSA Orbit No.44 Headset 1-1/8 x 1-1/4in Integrated | MEC