This headset cup can adapt Scott Roxter, Trek Roscoe, Avanti Montari and other bikes to take a tapered steerer fork like the Manitou JUnit
Bikes with a 44 mm head-tube usually measure 50 mm OD. They can be configured to take 1.125" straight steerer forks or 1.5" tapered forks.
To fit a 1.5" tapered fork you need an external 1.5" lower cup like this one.
On some bikes (like 20 inch Scott Roxter) the frame head-tube is not machined in deep enough.
The headset cup spigot will need machined down in length by 5 mm. We can do this for you