I can't imagine a bike frame being much more robust than the Pangea. It's basically the same build as the Americano, and draws a lot from their tandems. The down tube is huge and is the same size as the down tube on my Co-Motion tandem. It also has stronger tubes all around. I would think it would be fine for a heavier rider, as the 26" wheels are also stronger than most. Give Co-Motion a call and talk to them about it. They are very good to deal with and would be the best to offer opinions on this.

We actually just got our Pangeas a month ago as used bikes. So far I'm really liking it a lot. Just had it out yesterday as a matter of fact. Comparing it with my Co-Motion Nor'wester (700c), it's definitely stiffer and more "solid." I'm ~220#, so not a lightweight guy either.
[MENTION=306858]Corwin[/MENTION], where are you located?