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2. Bicycle helmet - Wikipedia

   en.wikipedia.org/wiki/Bicycle_helmet

   The bicycle helmet arm of Bell was split off in 1991 as Bell Sports Inc., having completely overtaken the motorcycle and motorsports helmet business. The first commercially successful purpose-designed bicycle helmet was the Bell Biker, a polystyrene-lined hard shell released in 1975.

3. Bicycle performance - Wikipedia

   en.wikipedia.org/wiki/Bicycle_performance

   From a mechanical viewpoint, up to 99% of the mechanical energy delivered by the rider into the pedals is transmitted to the wheels (clean, lubricated new chain at 400 W), although the use of gearing mechanisms reduces this by 1–7% (clean, well-lubricated derailleurs and a straight chainline), 4–12% (chain with 3-speed hubs), or 10–20% (shaft drive with 3-speed hubs).

4. Cycling - Wikipedia

   en.wikipedia.org/wiki/Cycling

   The price of a new bicycle can range from US$50 to more than US$20,000 (the highest priced bike in the world is the custom Madone by Damien Hirst, sold at US$500,000 [10]), [11] depending on quality, type and weight (the most exotic road bicycles can weigh as little as 3.2 kg (7 lb) [12]).

5. Motorcycle safety - Wikipedia

   en.wikipedia.org/wiki/Motorcycle_safety

   A full-face helmet after a crash Half helmets or "skid lids" meet minimum legal requirements in the United States. Helmet — Wearing a helmet reduces the rider's risk of death by 37% compared to riding without it. [62] A full-face helmet provides the most protection. Thirty-five percent of all crashes show major impact on the chin-bar area. [57]

6. Motorcycle helmet - Wikipedia

   en.wikipedia.org/wiki/Motorcycle_helmet

   A collection of full-face motorcycle helmets worn by Moto GP racer Valentino Rossi. A motorcycle helmet is a type of helmet used by motorcycle riders. Motorcycle helmets contribute to motorcycle safety by protecting the rider's head in the event of an impact. They reduce the risk of head injury by 69% and the risk of death by 42%.

7. Bicycle helmets in New Zealand - Wikipedia

   en.wikipedia.org/wiki/Bicycle_helmets_in_New_Zealand

   The current version of the statute, delineated in Part 11 of the Land Transport (Road User) Rule 2004 (SR 2004/427), states that "A person must not ride, or be carried on, a bicycle on a road unless the person is wearing a safety helmet of an approved standard that is securely fastened." The law describes six different acceptable helmet standards.