The kradschutzen served both as motorized infantry and as recon troops.
In the early part of the war, when light trucks to carry the motorized infantry were in short supply, it was not unusual to find a motorcycle company in every motorized infantry battalion. Because they could travel cross country with greater ease than their motorized brethren in trucks, the motorcycle troops often accompanied the panzers. They were also used to race ahead and capture key crossroads and bridges. While they might sometimes just roar through a village on their way to an objective, if they were close to their objective or thought the village might be occupied, they would dismount at a distance and approach on foot.
As more trucks became available, the motorcycle companies were pulled out of the motorized battalions and formed into motorcycle battalions.
Motorcycle troops, whether in recon units or motorized units, should be thought of as infantry. As halftracks became available, many motorcycle units were reequipped with them. Other motorcycles continued to be used for messengers, etc.