I believe most used pulley combination is 36T with 16T.
Getting a 100mm wheels (like MBS) whilst keeping the 16T motor pulley with 40T wheel pulley (probably the next one most used) would lower the torque significantly.
So I was thinking, having a 15T motor pulley on the motor and 36T pulley for normal wheels and 44T pulley for bigger wheels would keep the same top speed and torque allowing you to very easily swap the normal FlyWheels and AT wheels. Take off 4 wheel screws, put the AT wheels and a longer belt, screw the wheels back, boom you’re done
I just need to see if there is any interest in the kit from the topic name so we could perhaps do a group buy because the supplier has MOQ requirements.