The MC21 has exactly the same setup on the fork legs. The "rings" are there to facilitate setting of the stock ride-height at the factory.
No MC28 information is included in the setup in out Tuning pages as it was never included in the HRC setup manual.
The geometry for the '21 and '28 is identical however, so the MC21 setting should be fine for the '28.
10mm is a good starting point for the MC21 and MC28 - 14mm is very agressive and will scrub the front tyre out very quickly.
Andy.
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