Abstract: A vehicle including a body frame (20) commonly used on a two-wheeled automotive vehicle (10), a three-wheeled automotive vehicle (140), and a four-wheeled automotive vehicle (200). A head pipe (23) is formed on a front frame (22) of the body frame. The head pipe has an adjustment mechanism (60) for adjusting a position and an angle of a center line (A1) of a steering shaft (42) relative to a center line (C1) of the head pipe. A rear frame (24) of the body frame has rear walls formed with pluralities of rear mount portions (27) to allow rear units (91, 171, 265) of different kinds for the two-, three- and four-wheeled automotive vehicles to be selectively mounted.