Gravel and cyclocross tyres

A smooth centre with more pronounced sides is the most versatile: it rolls quickly on tarmac and still grips in a corner on gravel. A coarse tread with larger gaps belongs in the mud, so it doesn't get clogged. Width is crucial for gravel, because lower pressure gives both comfort and grip — just check the clearance in the frame and fork, so the tyre doesn't rub. A tubeless setup with sealant is practically the standard here.