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Frame: the mechanical core of a bicycle, the frame provides points of attachment for the various components that make up the machine. The term is variously construed, and can refer to the base section, always including the bottom bracket, or to base frame, fork, and suspension components such as a shock absorber
A 2008 Specialized Stumpjumper with full suspension. The Specialized Stumpjumper is a mountain bike produced by Specialized Bicycle Components. When it was first produced in 1981, the Stumpjumper was the first mass-production mountain bike. The Stumpjumper is still in production, although its design has changed significantly since it was first ...
The 'diamond' frame's central, horizontal top bar forces the rider to swing a leg over the bicycle's seat. A Triumph step-through, ladies', or open frame Dursley Pedersen bicycle circa 1910 A penny-farthing photographed in the Škoda Auto Museum in the Czech Republic A Brompton folding bicycle Bicycle in Victorian Plymouth, England, with a predecessor of the Starley diamond-frame A cantilever ...
The bottom bracket height is the vertical distance from the center of the bottom bracket to the ground, and it expresses clearance of the frame over obstacles. The height of the bottom bracket is of concern when designing the frame. The height of the bottom bracket is the baseline for the rider's height while riding.
Specialized also introduced the first major production mountain bike in the world, the Stumpjumper, in 1981. Like the Sequoia and Allez, the Stumpjumper was designed by Tim Neenan and based on an early Tom Ritchey design. Specialized continues to produce bikes under the Stumpjumper name, including both hardtail and full-suspension models. [8]
Downhill frames are also overbuilt to handle the stress of riding over rocky terrain, drops, and jumps. Bike weights have been typically over 34 lb (15.4 kg), but modern downhill bikes have broken the 30 lb (13.6 kg) weight barrier (with some custom builds on carbon frames weighing between 27–29 lb (12–13 kg)).
Rack with sample component sizes including an A/V half-rack unit. A rack unit (abbreviated U or RU) is a unit of measure defined as 1 + 3 ⁄ 4 inches (44.45 mm). [1] [2] It is most frequently used as a measurement of the overall height of 19-inch and 23-inch rack frames, as well as the height of equipment that mounts in these frames, whereby the height of the frame or equipment is expressed ...
2020 full suspension mountain bike. A mountain bike (MTB [1]) or mountain bicycle is a bicycle designed for off-road cycling. Mountain bikes share some similarities with other bicycles, but incorporate features designed to enhance durability and performance in rough terrain, which often makes them heavier, more complex and less efficient on smooth surfaces. [2]