Command and Conquer: Tiberium Wars concept bikes.

"Command & Conquer: Tiberium Wars is the long awaited sequel to Command & Conquer: Tiberian Sun. The is set during the Third Tiberium War with the Brotherhood of Nod, now with the support of the world's population within yellow zones, launching a major offensive against the Global Defense Initiative.

Tiberium Wars is currently a working title, orginally titled Incursion when it was a concept, it may yet be named something else entirely. The game uses a 'heavily modified and improved' version of the Sage Engine from C&C Generals and Battle for Middle Earth 1 & 2."