Motorcycle helmets do not expire like food, but their protective materials age and can be damaged by impact, heat, chemicals, sweat, ultraviolet exposure, and poor storage.

In motorcycles, cc means cubic centimeters, a unit used to describe engine displacement. A 500 cc motorcycle has an engine whose cylinders displace about 500 cubic centimeters of air-and-fuel volume through a complete piston cycle.

A motorcycle bolt is a threaded fastener used to hold components together under vibration, heat, road impact, and repeated loading.

The fastest motorcycles in the world include track-only machines, street-legal superbikes, and specially prepared record motorcycles.

The motorcycle used by Owen Grady in the 2015 Jurassic World film is a Triumph Scrambler motorcycle, generally identified as the air-cooled 865 cc model.

Carbon fiber composite can provide a much higher strength-to-weight ratio than steel, but it is not stronger than every steel grade in every situation.

Rust inside a motorcycle gas tank should be removed only after the fuel has been drained safely and the tank has been isolated from every ignition source.

Carbon fiber is a group of extremely fine, carbon-rich filaments valued for high strength, high stiffness, low weight, and resistance to ordinary rust.

Carbon fiber composite can be stronger and much stiffer than aluminum relative to its weight, but it is not universally stronger in every direction or under every type of load.

Cleaning a gas tank means removing old fuel, loose deposits, water, sludge, or light internal contamination without creating a fire, explosion, or chemical-exposure hazard.