Would anybody know what is the standard dimensions of Campy (Record or Chorus) threadless 1" headset? Park tools list two standards:
1. One-inch "Japanese Industrial Standard" (JIS):
It looks to me that most 1" forks in US are the "Modern European" standard since the fork crown races are 26.5 mm. I think even Chris King threadless 1" headset is this standard since it requires head tube dia = 30.1 mm and fork race = 26.5 mm.
Thanks,
Bo
1. One-inch "Japanese Industrial Standard" (JIS):
- Common on many Asian manufactures bicycles, both road and MTB
- Fork column outside diameter- 25.4mm (1")
- Head cup race OD- 30.0mm
- Acceptable head tube ID range- 29.75mm to 29.9mm
- Fork crown race ID- 27.0mm
- Fork crown seat OD acceptable range- 27.1mm to 27.2mm
- Threadless stem diameter- 25.4mm (1-inch)
- Many road bike and some MTB bikes
- Fork column outside diameter- 25.4mm (1-inch)
- Head cup race OD-30.2mm
- Acceptable head tube ID range- 29.9mm to 30.1mm
- Fork crown race ID- 26.4mm
- Fork crown seat OD acceptable range- 26.5mm to 26.7mm
- Threadless stem diameter- 25.4mm (1-inch)
It looks to me that most 1" forks in US are the "Modern European" standard since the fork crown races are 26.5 mm. I think even Chris King threadless 1" headset is this standard since it requires head tube dia = 30.1 mm and fork race = 26.5 mm.
Thanks,
Bo