I don't see it either, and when I click on the 2nd link you have there, I get an insufficient privileges error.

In any event, I don't think you want posts in the trike sub-sub-forum to appear in a different list than the posts in the 'regular' recumbent sub-forum. As others have said, the pie is already too small to subdivide. It will make the place look even deader than it already is.

I also agree with the idea of tweaking the name, and perhaps the line under the main page that currently says "What IS that thing?! Recumbents may be odd looking, but they have many advantages over a "wedgie" bicycle. Discuss the in's and out's recumbent lifestyle in the recumbent forum."

I think it's a little off putting, for both those who like recumbents and those who don't. The first bit slightly demeaning, annoying those who ride recumbents. And the second half of the second sentence gets slightly into the adversarial us vs. them BS that I think is unhealthy. Unhealthy in that it's potentially off putting to those who don't ride recumbents now, but are potentially interested in them, but hate 'bents are superior' evangelism.