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There are many different types of motorcycle frame, from a standard ‘single cradle’ to sports bike ‘perimeter’ frame.
The cradle frame is made from a single main steel tube above the engine and smaller tubes below. This design is well used in off-roaders and cruisers.
The perimeter frame consists of two strong aluminium arms that connect the steering head to the rear swing arm. Some Italian bikes use a steel version of this design with large number of short tubes forming a trellis pattern.
There is also a backbone frame – a simple design where the engine hangs from a thick main tube.
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