ok, so a new, I'll call trend, is this 27.5+ stuff. my basic understanding is that you're able to run wider 27.5 tires, up to 2.8 or so. I've also noticed, at least on one bike, that along with 27.5+ I could also run 29 wheel set too. so as I look at it, this seems to be the best of 2 maybe 3 worlds. 1. you can run a wider tires, not quite fat bike wide but wide enough. 2. I could also run 29 wheels. 3. is it also possible to run just straight 27.5 wheel sets? It appears to me that you could since you can run wider 27.5. It almost seems to be a no brainer. I'm thinking of building up a hard tail and if what I think is true, then getting a + sized frame would be the way to go. Right?