Normally and in relation to the driver, in order to verify the convenient height of the seat of a motorcycle to the ground and its driving position, he must:
There is no precept to observe that the driver is not required to reach the ground with his feet.
Sit on the motorcycle with your hands on your wrists and in a way that allows you to have both feet on the road simultaneously in a sitting position.
Sit on the motorcycle with your hands on your wrists, just having the toes of one of your feet flat on the floor.