Boost isn’t a good indicator tbh, there’s 29ers with standard rears that’ll do 3.0 and boost rears that won’t comfortably do 2.8.
Does it have to be frame only? Orbea Loki is looking pretty nifty.
Still think WTB (since they do rims and tyres) should make a printable template of, say, a scraper with all their plus tyres on it. Print it on a3, stick it to a bit of cardboard, fire it into your bike, done. Wouldn’t be the be-all since I’m assuming WTB’s plus size tyres are as randomly sized as all their other tyres but it’d be a huge, er, Plus. Actually, forget about printable- get some made up in plastic and send them out to all their LBSs. It’d be bound to make sales from the curious.
Orange are claiming stiffness but call me skeptical, the swingarm design is inherently flexy and their OE wheels are usually pretty low quality… if they really wanted to make things stiffer they could have done it years ago without changing a part, but it didn’t make for good advertising copy. And I reckon the other bits will probably still be just as bendy.