I did it in reverse: gravel to "road.". My first "gravel" bike was a '16 Diverge (frame was unchanged from '15), which was really a 2014 Roubaix with tire clearance up to 35mm and a slightly slacker geometry. It was originally spec'd with a 50-34 crankset and 11-32 cassette. It now has a 52-36 and 11-34 respectively. It is not as "fast" my SL6 or SL7, but it isn't far off. With 32mm tires that inflate to 35mm (wide internal rims), set up tubeless, it can handle all but the nastiest, chunkiest gravel and it is a great foul weather bike.