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In the days of quill stems, a road stem was clearly identifiable from its "number 7" shape, but nowadays it can be hard to tell the difference between a "road" (26.0 mm) and "MTB" (25.4 mm) stem. Manufacturers frequently omit the clamp size from advertising or packaging. BMX bikes usually have a 22.2 mm diameter clamp size.
EN 1078, entitled Helmets for pedal cyclists and for users of skateboards and roller skates, is a European standard published in 1997. It is the basis of the identical British Standard BS EN 1078:1997. [1]
The U.S. Consumer Product Safety Commission (CPSC) has warned that children should not wear bike helmets while using playground equipment, or any time when they are not biking, because of the risk of strangulation by the helmet strap should the helmet or strap be caught in playground equipment, a tree being climbed, and so on. [48]
By law, all helmets sold in the U.S. must meet standards set by the Consumer Products Safety Commission (CPSC). [5] There were two helmet recalls in the year 2000. [1] A helmet made by Rand International of Farmingdale, NY was voluntarily recalled and involved 70,000 helmets known as "L.A. Cruisin' Bike Helmets" in child, youth and adult sizes. [1]
Bell moved to Long Beach, California in 1968. The first Bell helmet with full-face protection was developed at this location. [7] In 1980, the company merged with football helmet maker Riddell to form "Bell-Riddell". The Bell-Riddell motorcycle division was sold in 1991, becoming "Bell Helmets". The remaining company was renamed "Bell Sports".
Mountain biking (abbr. MTB) is a sport of riding bicycles off-road, often over rough terrain, usually using specially designed mountain bikes.Mountain bikes share similarities with other bikes but incorporate features designed to enhance durability and performance in rough terrain, such as air or coil-sprung shocks used as suspension, larger and wider wheels and tires, stronger frame materials ...
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27.5 Mountain bike A mountain bike with wheels that are approximately 27.5 inches (700 mm) in diameter and are based on ISO 584 mm (650B) rims. 29er (bicycle) A mountain bike with wheels that are approximately 29 inches (740 mm) in diameter and are based on ISO 622 mm (700C) rims. [1] [2] 3:1 rule