Ebike PAS Magnet ring, Chain ring replacement

This is a Pedal Assist Sensor PAS magnet ring that replaces the smallest chain ring on the cranks for an Ebike. Most Magnet rings will not fit modern chainrings and I figured having a motor I will no longer need the smallest chain ring so I designed this to replace it.

Twelve 5 x 2mm magnets are required.

The Openscad file can be modified to suit your requirements.