Z Specification:
◎ EC34/28.6∣EC34/30
◎ TOP NUT: 1 1/8"
◎ CUP O.D.: 34
◎ CROWN CONE: 30
◎ Height: 22.9mm
◎ Steel, Ball Retainers
Z1 Specification:
◎ EC29/25.4∣EC29/27
◎ TOP NUT: 1"
◎ CUP O.D.: 30
◎ CROWN CONE: 27
◎ Height: 22.8mm
◎ Steel, Ball Retainers
Threadless Headset Z/Z1