Abstract: A vehicle body frame structure for a saddle riding type vehicle, the vehicle body frame structure includes main frames formed by coupling main tubes extending rearwardly downward from a head pipe supporting a front wheel via a front fork to pivot frames supporting a rear fork by rear end portions of the pivot frames, and a rear frame in a rear of the main frames, the rear frame being formed of a fiber reinforced resin and supporting a seat. The rear frame includes upper side attaching portions attached to the main frames, a pair of left and right upper side portions linearly extending rearward from the upper side attaching portions, and a cross member laterally coupling the upper side portions to each other. The cross member includes a bulging portion bulging above the upper side portions.

Abstract: A handling performance is improved by a fuel tank fitting structure. A fuel tank is mounted to a vehicle body frame at three points: a first fixed section with a bolt and two second fixed sections with two bolts. A grommet provided in the first fixed section has an interference. Each of the second fixed sections has a fitting clearance between a collar and the grommet, and an axial clearance between the collar and the grommet. These clearances enable the grommet without an interference and the fuel tank to relatively movable to the vehicle body frame. The fuel tank and a vehicle body thus have different behaviors during cornering, thereby obtaining reduced inertial weight and light handling.

Abstract: A handling performance is improved by a fuel tank fitting structure. A fuel tank is mounted to a vehicle body frame at three points: a first fixed section with a bolt and two second fixed sections with two bolts. A grommet provided in the first fixed section has an interference. Each of the second fixed sections has a fitting clearance between a collar and the grommet, and an axial clearance between the collar and the grommet. These clearances enable the grommet without an interference and the fuel tank to relatively movable to the vehicle body frame. The fuel tank and a vehicle body thus have different behaviors during cornering, thereby obtaining reduced inertial weight and light handling.

Abstract: A vehicle body frame structure for a saddle riding type vehicle, the vehicle body frame structure includes main frames formed by coupling main tubes extending rearwardly downward from a head pipe supporting a front wheel via a front fork to pivot frames supporting a rear fork by rear end portions of the pivot frames, and a rear frame in a rear of the main frames, the rear frame being formed of a fiber reinforced resin and supporting a seat. The rear frame includes upper side attaching portions attached to the main frames, a pair of left and right upper side portions linearly extending rearward from the upper side attaching portions, and a cross member laterally coupling the upper side portions to each other. The cross member includes a bulging portion bulging above the upper side portions.