Biker o bmx en ingles
Páginas: 4 (913 palabras)
Publicado: 19 de marzo de 2012
BMX OR BIKE
A BMX bike or BMX is the name of a popular bicycle which is used for both casual use and sport and is designed mainly for dirt and motocross cycling.[1] "BMX" is the usual abbreviationfor bicycle motocross.
Construction
Though originally connoting a bicycle intended for BMX Racing, the term "BMX bike" is now used, generically, to encompass race bikes, as well as those used forthe dirt, vert, park, street and flatland disciplines of BMX.
BMX frames are made of various types of steel, and (largely in the racing category) aluminum. Cheaper, low end bikes are usually made ofsteel. Mid range bikes are mostly chromoly or hi tensile steel, which are about the same in weight and strength. High-performance BMX bikes use 4130 chromoly, or generation 3 chromoly.
Theintroduction and widespread popularity of the cassette hub has ushered in the use of smaller gearing on BMX bikes. Instead of the old 44/16 gearing found on almost all older BMX bikes, new bikes use gearing suchas 36/13, 33/12, 30/11, 28/10, 25/9, and even 23/8, all of which have similar gear ratios of almost 2.8:1. Advantages of smaller gearing hubs include lighter weight, and more clearance when grinding.The freewheel hub is all but extinct due to several factors. The smallest freewheels can be made is with 13 teeth, which is larger than most riders prefer. Also, they are less consistent thancassette hub, and skip or jam up far more frequently.
On most freestyle, dirt jumping & street BMX bikes, the wheels have 36 spokes, with more aggressive riders using 48 spoke wheels, due to the extrastrength afforded them. Race bike
wheels are also usually 36 spokes, but wheels for the smallest racers (sometimes as young as three years old) can be built with 18 or 28 spokes.
BMX Racing bikewheels vary in size, from 18" to 26" (with 20" being the most popular).
Dirt jumping and freestyle bike wheel sizes include 16" and 18" for younger, smaller riders, 20" for most other riders, and...
A BMX bike or BMX is the name of a popular bicycle which is used for both casual use and sport and is designed mainly for dirt and motocross cycling.[1] "BMX" is the usual abbreviationfor bicycle motocross.
Construction
Though originally connoting a bicycle intended for BMX Racing, the term "BMX bike" is now used, generically, to encompass race bikes, as well as those used forthe dirt, vert, park, street and flatland disciplines of BMX.
BMX frames are made of various types of steel, and (largely in the racing category) aluminum. Cheaper, low end bikes are usually made ofsteel. Mid range bikes are mostly chromoly or hi tensile steel, which are about the same in weight and strength. High-performance BMX bikes use 4130 chromoly, or generation 3 chromoly.
Theintroduction and widespread popularity of the cassette hub has ushered in the use of smaller gearing on BMX bikes. Instead of the old 44/16 gearing found on almost all older BMX bikes, new bikes use gearing suchas 36/13, 33/12, 30/11, 28/10, 25/9, and even 23/8, all of which have similar gear ratios of almost 2.8:1. Advantages of smaller gearing hubs include lighter weight, and more clearance when grinding.The freewheel hub is all but extinct due to several factors. The smallest freewheels can be made is with 13 teeth, which is larger than most riders prefer. Also, they are less consistent thancassette hub, and skip or jam up far more frequently.
On most freestyle, dirt jumping & street BMX bikes, the wheels have 36 spokes, with more aggressive riders using 48 spoke wheels, due to the extrastrength afforded them. Race bike
wheels are also usually 36 spokes, but wheels for the smallest racers (sometimes as young as three years old) can be built with 18 or 28 spokes.
BMX Racing bikewheels vary in size, from 18" to 26" (with 20" being the most popular).
Dirt jumping and freestyle bike wheel sizes include 16" and 18" for younger, smaller riders, 20" for most other riders, and...
Leer documento completo
Regístrate para leer el documento completo.