QuoteGreatly appreciate the replies!

So are the FM-909 and FM-936 basically the same frame geometry, just different weights, or am I missing some other aspects that makes these frames different?

Geo looks the same.   936 is a rocker link vs the swing link of the 909, so the 909 has 2 bottle mounts in the front triangle.  Looks like the 909 has shorter seat tubes than the same size 936 as well.  909 has mounts for a chain retention device.  Seat tube diameter is diff too.

Thanks! I don't know enough to understand the tradeoffs between rocker vs swing (other than room for 2 water bottles). If there is a link to a good explanation would like to learn.