This hub adapter is for Rotrex superchargers made before January 2022.
If you use a custom made pulley for your supercharger, it must be made to bolt to the supercharger using this hub adapter.
Most Rotrex superchargers shipped from Rotrex with the standard steel single bolt pulley. Some Rotrex superchargers left Rotrex with this hub adapter on it intending to use a custom made pulley.
Starting in January 2022 all Rotrex superchargers where fitted with a hub adapter and that must never be removed.
Rotrex has discontinued the steel single bolt pulley. URD has a significant inventory or the original single bolt pulley made of steel, but once they are gone they are gone.
Rotrex now makes an aluminum 8 rib pulley designed to use the hub adapter. URD Stocks these new style pulleys.
You can convert your older Rotrex supercharger to use the new style pulley by installing this hub adapter.
Important notes- This hub adapter will only fit Rotrex C series supercharger made before January 2022. It will not fit supercharger made January 2022 due to a change in the input shaft. This hub adapter will not fit the C38R series superchargers.