Literally the 700c road frames you know and love with added tyre.
27.5 MTBs (and access to wheel sets) have arrived just as road 700c road bikes go to 135 spacing and discs (no long-drop calipers needed), it's going to be so easy to go 650b.
There's no reason why you couldn't use 584-32 tyre through the winter and 622-25 in the summer on the same, proper road bike with no longer chainstay compromise.
Literally the 700c road frames you know and love with added tyre.
27.5 MTBs (and access to wheel sets) have arrived just as road 700c road bikes go to 135 spacing and discs (no long-drop calipers needed), it's going to be so easy to go 650b.
There's no reason why you couldn't use 584-32 tyre through the winter and 622-25 in the summer on the same, proper road bike with no longer chainstay compromise.