Understanding Motorcycle Frame

By Indra Gunawan

motorcycle frames

What is a Motorcycle Frame?

A separate pivot point is designated for the swing arm, a fork like frame that holds the rear wheel and suspension components. The rider saddle, or seat, is often mounted to the frame for most cruiser type motorcycles. Ideally, a frame should be lightweight yet strong enough to support the motorcycle’s components.

cradle frame

Cradle Frames

Cradle type frames, used since the early days of the motorcycle, appear in variations. Single cradle frames are characterized by a single down tube that extends below the steering head and under the motor to reconnect at the spine to form a cradle for the motor. Modern full cradle frames are used mostly by cruiser and chopper style motorcycles.

twin-spar frame

Twin Spar (Perimeter) Frames

Used mostly by sport bikes, twin spar frames maintain their strength against the tremendous power output of these high performance machines. The motor is mounted to the frame as a central stressed member, acting as the main load bearing component of the frame.

Trellis Frames

Trellis frames use short sections of aluminum or steel tubing that are welded together similar to a twin spar frame. Trellis frames are found mostly on European motorcycles, with Ducati’s frames often referred to as artful masterpieces. Lightweight and very rigid, the trellis frames offers greater strength than a twin spar frame, but are more complex and difficult to build.

monocoque frame

Monocoque Frames

Acting as a single unit, a monocoque frame gains strength by placing its load on the external surface of the frame, offering certain advantages offset by greater weight.

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