You take unpaved roads to avoid traffic. Where your comfortabley wide tires may sometimes lose contact with the ground when riding drops up to 15 cm high. If the trail gets steeper, the motor of your gravel bike will help you along and reliably bring you and your baggage to your destination each day of on your lengthy bikepacking tour. All the carbon and aluminum models in the Hybrid Gravel category are available in the standard wheel size 700C and the smaller 650B size. This wheel category needs disc brake systems, given the stronger forces triggered by the various stresses you encounter on the terrain.