The 1.5 is for a 1 1/2" frame with 1 1/2" forks. (eg Cannondale, Orange) If you are using a 1 1/2" frame with 1 1/8" forks, see the FSA The Big Fat Pig 1.5R Headset.
Features
- Forged chromoly cups
- 1.5" steerer 7/32" caged bearings
- 21mm headtube insertion
- Stack height 16.9+11.7=28.6
- Weight: 310.3g