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Any bike you put gravel tires on or slap a direct drive trainer on...
My caveat was: "if you pick the right bikes up front." If there's one thing I would look for when buying bikes to serve multi purposes it would be tire clearance. Gearing (and other components) you can after market adapt. Almost any road or FG bike can do gravel if you can fit decent tires on though, depending on how much you wat to beat up a really nice road bike. Of course, you are limited somewhat by the gearing of FG's. Burt a lot of gravel is flat for some so that's not an issue.
Last edited by Happy Feet; 09-25-18 at 07:51 AM.