The NEO does not need a lot of maintenance, but the movable parts do.
Greasing the body
If there is a sound related issue that is refered as "cracking sound when riding" then this is an issue related to the cassette and body. We advise to clean the axle and grease the inside of the body. Also cleaning the cassette is advised to prevent vibrations and sounds
Alan key : 5mm
Click here for more information.
Metal sound between the disc
There are very strong magnets on the inside of the disc. This could revert to a metal to metal sound. The issue could be related to a very small metal piece. This is also demonstrated in one of these videos