A vehicle body frame includes a head section that rotatably supports a steering shaft, and main frames extending from the head section toward a rear side of a vehicle body. A cross section of the main frame in a direction crossing a vehicle body forward/rearward direction is formed in a substantially rectangular shape having a vertical width larger than a lateral width. A carbon fiber reinforced resin in which carbon fibers are oriented uniformly in the vehicle body forward/rearward direction is installed on at least one of upper surfaces and lower surfaces of the main frames.

A vehicle body frame includes a head section that rotatably supports a steering shaft, and main frames extending from the head section toward a rear side of a vehicle body. A cross section of the main frame in a direction crossing a vehicle body forward/rearward direction is formed in a substantially rectangular shape having a vertical width larger than a lateral width. A carbon fiber reinforced resin in which carbon fibers are oriented uniformly in the vehicle body forward/rearward direction is installed on at least one of upper surfaces and lower surfaces of the main frames.

There is provided a swing arm configured to be coupled to a vehicle body frame to be vertically swingable via a pivot shaft. A main body has a pivot pipe in which the pivot shaft is to be inserted. A pair of right and left arm parts extend rearward from the main body. The main body is made by casting to have a hollow structure. The main body is provided with a rib configured to vertically partition an internal space thereof. The rib is connected to the pivot pipe at a place spaced from a connection place between the pivot pipe and an outer wall part defining an outer surface shape of the main body.

There is provided a swing arm configured to be coupled to a vehicle body frame to be vertically swingable via a pivot shaft. A main body has a pivot pipe in which the pivot shaft is to be inserted. A pair of right and left arm parts extend rearward from the main body. The main body is made by casting to have a hollow structure. The main body is provided with a rib configured to vertically partition an internal space thereof. The rib is connected to the pivot pipe at a place spaced from a connection place between the pivot pipe and an outer wall part defining an outer surface shape of the main body.

There is provided a swing arm configured to be coupled to a vehicle body frame to be vertically swingable via a pivot shaft. A main body has a pivot pipe in which the pivot shaft is to be inserted. A pair of right and left arm parts extend rearward from the main body. The main body is made by casting to have a hollow structure. The main body is provided with a rib configured to vertically partition an internal space thereof. The rib is connected to the pivot pipe at a place spaced from a connection place between the pivot pipe and an outer wall part defining an outer surface shape of the main body.

There is provided a swing arm configured to be coupled to a vehicle body frame to be vertically swingable via a pivot shaft. A main body has a pivot pipe in which the pivot shaft is to be inserted. A pair of right and left arm parts extend rearward from the main body. The main body is made by casting to have a hollow structure. The main body is provided with a rib configured to vertically partition an internal space thereof. The rib is connected to the pivot pipe at a place spaced from a connection place between the pivot pipe and an outer wall part defining an outer surface shape of the main body.

There is provided a frame structure for an electric motorcycle. A plurality of electric components are mounted in a chassis framework comprised of a pair of half-frame bodies. One of the half-frame bodies is formed into a module to which electric components are connected via cables.

There is provided a frame structure for an electric motorcycle. A plurality of electric components are mounted in a chassis framework comprised of a pair of half-frame bodies. One of the half-frame bodies is formed into a module to which electric components are connected via cables.

A motorcycle has a main frame with main frame tubes formed of a first material such as 30CrMo steel tubing. A sub-frame with sub-frame tubes of the first material extends longitudinally and is detachably connected behind the main frame. A middle frame with vertically-extending legs provided by castings is behind the main frame, cast of a second material such as from ZGD410-700 stainless steel. A tailframe is detachably connected behind the sub-frame, the tailframe having tailframe plates of a third material, such as being cast from aluminum or an aluminum alloy. A thickness of the tailframe plates is in the transverse direction. A bottom support is substantially arranged below the main frame, detachably connected to the main frame and to the middle frame. Connection fittings formed of a fourth material such as forged 30CrMo steel can be used for the detachable connections of the tubes.

A motorcycle has a main frame with main frame tubes formed of a first material such as 30CrMo steel tubing. A sub-frame with sub-frame tubes of the first material extends longitudinally and is detachably connected behind the main frame. A middle frame with vertically-extending legs provided by castings is behind the main frame, cast of a second material such as from ZGD410-700 stainless steel. A tailframe is detachably connected behind the sub-frame, the tailframe having tailframe plates of a third material, such as being cast from aluminum or an aluminum alloy. A thickness of the tailframe plates is in the transverse direction. A bottom support is substantially arranged below the main frame, detachably connected to the main frame and to the middle frame. Connection fittings formed of a fourth material such as forged 30CrMo steel can be used for the detachable connections of the tubes.