Trek Speed Concept (Gen 1) Headsets

- Steerer outer diameter: 28.6mm (1-1/8")
- Crown race inner diameter: 30mm
- Cup Insertion OD: Integrated
- Stack height: 15.7mm
- Bearing Type: Sealed
- Headset type upper: Unthreaded fully integrated
- Headset type lower: Fully integrated
- Material: Aluminum