after 2 months finally a update! After LOTS of hours of measuring, drilling, dremeling, filing and so on I came to this result. The aluminium 7075 is really strong stuff by the way! It's not finished yet, I need to make 3 pipes from aluminium to secure both pieces of alu with the 3 screws you can see. Also I need to drill out the bore of the small sprocket so it will fit the 12mm motorshaft and ofcourse I need to make something so that it can be mounted on the bike. (But I'm very busy with school, so it could take a while till I get that done)

Both pieces


If you look closely you can see that I left just a little aluminium in the big hole so the bearing won't slip away.


Fitted bearings and mounted the motor


Complete drive unit front side


Complete drive unit back side


Complete drive unit up side



- Patrick