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Sincerely Your, SURF3DMORE INFORMATION ABOUT 3D MODELS :A MOTORCYCLE FRAME IS A MOTORCYCLE'S CORE STRUCTURE. IT SUPPORTS THE ENGINE, PROVIDES A LOCATION FOR THE STEERING AND REAR SUSPENSION, AND SUPPORTS THE RIDER AND ANY PASSENGER OR LUGGAGE. ALSO ATTACHED TO THE FRAME ARE THE FUEL TANK AND BATTERY. AT THE FRONT OF THE FRAME IS FOUND THE STEERING HEAD TUBE THAT HOLDS THE PIVOTING FRONT FORK, WHILE AT THE REAR THERE IS A PIVOT POINT FOR THE SWINGARM SUSPENSION MOTION.
MOTOCROSS IS A FORM OF OFF-ROAD MOTORCYCLE RACING HELD ON ENCLOSED OFF-ROAD CIRCUITS. THE SPORT EVOLVED FROM MOTORCYCLE TRIALS COMPETITIONS HELD IN THE UNITED KINGDOM. THE FRAME IS TYPICALLY MADE FROM WELDED ALUMINIUM OR STEEL (OR ALLOY) STRUTS, WITH THE REAR SUSPENSION BEING AN INTEGRAL COMPONENT IN THE DESIGN. CARBON FIBRE, TITANIUM, AND MAGNESIUM ARE USED IN A FEW VERY EXPENSIVE CUSTOM FRAMES.
THE FRAME INCLUDES THE HEAD TUBE THAT HOLDS THE FRONT FORK AND ALLOWS IT TO PIVOT. SOME MOTORCYCLES INCLUDE THE ENGINE AS A LOAD-BEARING STRESSED MEMBER; THIS HAS BEEN USED ALL THROUGH MOTORCYCLE HISTORY BUT IS NOW BECOMING MORE COMMON.