I speak with Ryan from RNC regularly & he wants to only make cranks with a 24mm spindle only for now on. I tried to talk him into at least a 22mm version, but to no avail lol I explained to him that there is currently no existing Spanish BB that is 24mm compatible. There are bearings of course, but not a complete BB Set. Fortunately, he's made an adapter that will work on a couple of micro sprockets that are newly out that will allow them to be converted to 24mm. I don't know of any Flatlanders that ride 24mm cranks for these reasons, I guess we'll see what happens...