Upper: 1-1/8"" / Steel cup / Z-type Bearing / For ID 41.1mm Head Tube Bottom: 1-1/8"" / Steel cup / Z-type Bearing / For ID 41.1mm Head Tube w/4mm ABS Top Cover Stack Height 21+2.8=23.8mm
K-803
Upper:
1-1/8" / Steel cup / Z-type Bearing /
For ID 44mm Head Tube
Stack Height 21+3=24mm