In order to reduce friction in campa hubs, I machined a cone similar to the campa one but in bronze that has got better "sliding" properties than aluminium or steel. The friction coefficient is lower and will make easier the spinning motion.
While taking the bearing and the cone in hand, the difference is clear; the bronze cone reduce the friction.
A test will be realized in some days, it will take into accout the time the wheel need to stop from a fixed speed for the original cone and the tuned one.
Here are both cones weights:
However, the test is only static. A test under load would be certainly different, I’ll realize the test with the brand-new cone and I’ll check its status after some hundreds kilometers. I’ll then redo the test to see the difference between the initials and the finals conditions.