The side project is finished!!,  I failed to reach sub 60 grams but 0.4 grams is not so much to talk about.

The final spacing is one thing left to do, I used 2.5mm thick carbon sheets , then the area around the teeths lathed down to 1.9mm.

The weight could be less by using 2mm sheets…

11-12T is in aluminum as the 11 and 12t in carbon would be very weak and breaking first.

Sending to a customer in USA who builds a very light road bike.

/Mattias the chief nailgunner.