A motorcycle frame is what provides a motorcycle with a skeletal structure, and is what all components found on a motorcycle attach to directly or indirectly. There are many different frame types used on motorcycles. Some frames are made from steel and others are made from aluminum. Motorcycle frames can use round, square or rectangular tubing or a combination of tubing shapes. Some frames use the engine as a structural component of the frame.
There are many factors that go into choosing a motorcycle frame, and can include motorcycle size, engine displacement, engine power, type of riding, cost, type of motorcycle (scooter, mini bike, etc), weight, strength, rigidity, competition use, etc.
The photo below is a single cradle frame and shows the basic parts of a motorcycle frame. A frame can also include additional parts like frame braces for support and frame stays for attaching components to the frame. A single and double cradle motorcycle frame are two very common frame types. A single cradle frame has a single front down tube and main pipe, and a double cradle frame has two front down tubes and one or two main pipes.
Here is a list of different motorcycle frames:
Single Cradle Frame
Double Cradle Frame
Backbone Frame
Underbone Frame
Diamond Frame
Perimeter Frame
Pivotless Frame
Trellis Frame
