Whether you call it "gravel grinding", "adventure rides", or something else, riding a drop-bar road bike with big tires on all surfaces is a blast.
Clement addresses the need for tires for this type of riding with the X'plor USH. This is a traditional clincher (i.e. inner tube type) tire featuring a smooth center tread for low rolling resistance that includes inverted tread so you still get traction on dirt roads. Toward the edges, the tread switches to pyramid knobs for control in rougher conditions and while cornering.
USH is named for the airport code of Ushuaia on the island of Tierra del Fuego, Argentina; there southernmost city in the world. This tire is perfect for dirt roads, touring, gravel, or urban assault.