Adapts Thomson 1-1/8" ahead steerer clamp to accept a 1" threadless steerer (designed for Thomson road stems, but will also work with mountain stems).
- Adapts: shim for 1-1/8-Inch stem to fit 1-Inch steerer, Clamp Diameter: N/A, Steer Tube Clamp Diameter: 1-1/8-Inch
- Adapts: shim for 1-1/8-Inch stem to fit 1-Inch steerer, Clamp Diameter: N/A, Steer Tube Clamp Diameter: 1-1/8-Inch