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.
Oil-in-frame (Oif) chassis, where the lubricating oil is stored in the frame of the motorcycle, was used for Vincent Motorcycles of the 1950s, and for a while during the 1970s on some NVT British motorcycles. It was widely unpopular and generally regarded as a bad idea at the time.
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