Get the noisy hubs as people have suggested above (chris king, dt swiss with a 24 tooth or more star ratchet, i9 etc) but also think about having that hub be part of a deep or deep-ish section carbon rim. It adds a resonance chamber to help amplify the sound. I have a pair of flo 45s and I have to be pedaling to talk to my wife on rides or else she can’t hear me over the sound of the freehub.
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