Are motorcycle mirrors necessary? Motorcycles must have at least 1 mirror located so as to give the driver a view of at least 200 feet to the rear of the vehicle. Prohibits a seat position too high for a motorcyclist's feet to reach the ground while driving. All riders and passengers of motorcycles and mopeds must wear a safety helmet. How do I keep my motorcycle mirror from moving? Dab some glue on, move the mirror around to coat the entire balljoint. Let it dry and then break the glue joint. You now have reduced the gap between ball & socket, mirror can still move - problem fixed. You can try blue lock tight.