The Harley Davidson 18-J is an American motorcycle first manufactured in 1918.
The MC 18J Sidecar is a light vehicle featured in Battlefield 1. It is the motorcycle of the Allied Powers, and is used by the British Empire and Kingdom of Italy. It can seat two players, a driver and a passenger in a sidecar who has access to their kit for self-defense. As with the M30 Scout, players enter the seats from different sides.
- Although of American design, none of the maps featuring the US Army feature motorcycles.
- The tread pattern on the tires read "non-skid", corresponding to a real World War 1 era tire manufactured by Firestone.