Wheels Manufacturing SOLO-HG Single Speed Conversion Kit - For HG Style Hubs BlueWheels Manufacturing SOLO HG Single Speed Conversion Kit For HG Style Hubs Blue. Take your drivetrain back to the basics with precision. The SOLO HG Single Speed Conversion Kit is engineered specifically for Shimano HG style freehub bodies. Whether youre building a commuter race rig or trail ready shredder this kit delivers clean chainlines and the durability Wheels Manufacturing is known for. Compatible with HG style freehubs ONLY (Cog sold