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Threaded headset. Traditional bicycle head tubes and headsets are sized for a 25.4 mm (1 in) diameter steerer tube (also known as the fork column). Many frame and fork manufacturers are now building their parts around a steerer tube with a diameter of 28.6 mm (1 + 1 ⁄ 8 in). The larger diameter of the head tube and headset gives added ...
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.
A bicycle head tube with a partially installed bicycle headset; the locknut has yet to be fitted onto the fork steerer tube. The head tube is the part of a cycle's tubular frame within which the front fork steerer tube is mounted. [1] On a motorcycle, the "head tube" is normally called the steering head.
Head tube: the tube of a bicycle frame that contains the headset; Headset: the bearings that form the interface between the frame and fork steerer tube; Hood: the rubber brake lever covering on bikes with drop style handle bars; Hub: the core of a wheel; contains bearings and, in a traditional wheel, has drilled flanges for attachment of spokes
EN 1078 specifies requirements and test methods for bicycle helmets, skateboard and roller skate helmets. It covers helmet construction including field of vision, shock absorbing properties, retention system properties including chin strap and fastening devices, as well as marking and information. [3] The standard's key features are: [1]
Ten different types of helmets with different design, materials, amount of head coverage, and accessories to provide maximum protection for specific use cases The French cyclist Jérémy Leveau wearing a bicycle helmet. A helmet is a form of protective gear worn to protect the head.
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%.
Road bikes usually use 68 mm (2.7 in); Italian road bikes use 70 mm (2.8 in); Early model mountain bikes use 73 mm (2.9 in). Later models (1995 and newer) use 68 mm (2.7 in) more commonly. Some downhill bikes even use an 83 mm (3.3 in) bottom bracket shell. Snow bikes use a 100 mm (3.9 in) shell.
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