It's so you can log more miles.

I still have my mostly-unworked Calfee frame kit. My wife bought it for me and I was supposed to work on it during our FMLA for the twins birth - but heck, twins, no time after all, and now they're four. It is supposed to be a 29er but there was an error on the plans - the BB drop was unchanged for the different wheel sizes. They have probably fixed it by now. I was planning to copy a Karate Monkey, but walked back from that when realizing it wasn't going to work with the plus tires because it can't have a BB yoke. If I take it up again I'll likely copy a Salsa Journeyman flatbar, which is pretty conventional. The cast wrap for the joints seems to have hardened up in its package, I would need to replace it.

Craig Calfee's idea was to send bike kits to Africa and they could use on-site materials or stuff that's easy to source. He started off with carbon fiber joints and switched to fiberglass-polyurethane cast wrap which medics can order and only needs water for activation and cleanup and not a problem to sand.