Originally Posted by glye

Self-replying, I got an answer from R&M via my LBS:



So the cassette replaces the extinct Shimano Capreo line, but isn't compatible with it. It is only compatible with the special Sunrace hub it fits. Sounds to me it would be better to go with an SRAM XD compatible hub, for a much wider selection in cassettes, and also allowing 10t and 9t cassettes. But no idea if the huge 42t - 50t cassette cogs would work within the Birdy frame.

Still, the Touring version it is slightly cheaper than the City version (Nexus 8 hub) so if I have to build a new wheel anyway, I might choose it.

I'm not allowed to answer private messages until I have 10 posts, so I'm answering here: Thanks. Yes, I mean the original R&M Birdy, not the Pacific.