I have seen on Insta (Yes i know, not the best place for news). But it looks like the 2021 S1000RR model has dropped the Hayes callipers and has Nissin. They're very similar to the M callipers but look cast. According to the post, all non RR models get Brembo and the S1000RR gets Nissin You can see more here: https://www.instagram.com/p/CMJEm6MgGgl/?utm_source=ig_web_copy_link