|Item name||mountain bike 29 bicicletas mountain bike 29 mountainbike mountain bike cycle mountain bike|
|Brand||OEM mountain bike 29 bicicletas mountain bike 29 mountainbike mountain bike cycle mountain bike|
|Brake||F: disc brake R: disc brake|
|Frame||aluminum alloy, inner cable 17 inch, straight head tube 120 mm|
|Chain||108 variable speed, positioning|
|Tyre||20×1.75/1.95 2.125 2.4 air/EVA tire|
|Saddle||good leather, common or spring /plastic/imitation leather/ plate PVC|
|Pedal||black aluminum alloy pedal|
|Chainwheel||one-piece crank, CP/ED/UCP, 12″24T×89/1628T×102/20″28T×127|
|Handlebar||4-points handlebar, CP, TIG welding, Φ22X0.8-1.5mm stem|
|Seat tube||black T 1.0 steel ￠27.2*300L|
|Rim||steel/aluminum alloy rim|
|Derailleur||Chinese brand/Shimano 21/27 speed derailleur|
About Mountain Bike:
Mountain bikes originated in the United States. In 1974, Gary Fisher, Charlie Kelly, and Tom Ritchey wanted a bicycle that could be ridden off roads, away from “police, cars and buildings”, so they began to install accessories and motorcycle parts. To the sturdy single ATV before World War II.
In the same year, Gary Fisher and his friends feared death’s “Tamal Pass Mountain Tour”, which paved the way for the birth of a new riding style. Following Gary Fisher’s huge response in the mountain area, his Klunker was subsequently selected as one of the “Top Ten Mountain Bikes in History” by Mountain Bike Action magazine.
In 1976, Charlie Kelly started to promote a new downhill race, which was the first great mountain biking event. Charlie Kelly commissioned manufacturer Joe Breeze to design and develop cross-country bikes, which were the first “mountain bikes” ever manufactured and named “Breeze”.
Joe Breeze used Breeze as the prototype to complete the design and manufacture of 9 series of models between 1977 and 1978. The prototype of Breeze is now in the collection of the National Museum of the Smithsonian Institution in the United States.
What does the 21-speed in the mountain bike mean?
The 21-speed mentioned in the mountain bike means that there are 21 kinds of gears. The front transmission has 3 gears and the rear transmission has 7 gears, so 3X7=21 gears.
The function of the speed gear is to adjust the speed.
Mountain bikes generally have 11 speeds, 18 speeds, 20 speeds, 21 speeds, 24 speeds, 27 speeds and 30 speeds.
The main features of mountain bikes are wide tires, straight handles, front and rear shock absorbers, and more comfortable riding. The wide, multi-tooth tires provide grip, and there are shock absorbers to absorb shocks. In recent years, the application of front shock absorption has become the standard, and vehicles with front and rear shock absorption have become more and more popular. Some mountain bikes began to use the vice bar, but the angled cross bar became fashionable. Handlebars above 800mm have become more common on DH cars.
The biggest feature of a general mountain bike is its excellent front fork shock absorber and a high-quality body made of steel, aluminum alloy or carbon fiber. In fact, this mountain bike has the characteristics that many riders desire. This kind of bike is usually durable and will not bring you maintenance troubles after many years of use. Generally, mountain bikes don’t care much about the weight of the bike itself, so its body structure is very sturdy.
It is not impossible to go in the direction of light weight, like extra-light steel or aluminum body can make the weight of the whole car lighter, but generally speaking, unless it is a mountain bike for competition purposes, the weight of the car itself is all not so important.