BMX bike

A BMX bike is an off-road sport bicycle used for racing and stunt riding. BMX means bicycle motocross.

Construction

Though originally denoting a bicycle intended for BMX Racing, the term "BMX bike" is now used to encompass race bikes, as well as those used for the dirt, vert, park, street, flatland and BMX freestyle 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 of steel. High range bikes are mostly chromoly or high tensile steel, although the latter is noticeably heavier with respect to strength. High-performance BMX bikes use lightweight 4130 chromoly, or generation 3 chromoly.

The introduction 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 such as 36/13, 33/12, 30/11, 28/10, 25/9, 23/8,and even 22/8, 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 that can be made is with 8 teeth, which is smaller than most riders prefer. Also, they are less consistent than cassette hubs, and skip or jam up far more frequently.

BMX

BMX, an abbreviation for bicycle motocross, is a cycle sport performed on BMX bikes, either in competitive BMX racing or freestyle BMX, or else in general on- or off-road recreation. BMX began when young cyclists appropriated motocross tracks for fun, racing and stunts, eventually evolving specialized BMX bikes and competitions.

History

BMX began in the early 1970s when children began racing their bicycles on dirt tracks in southern California, inspired by the motocross stars of the time. The size and availability of the Schwinn Sting-Ray and other wheelie bikes made them the natural bike of choice for these races, since they were easily customized for better handling and performance. BMX racing was a phenomenon by the mid-1970s. Children were racing standard road bikes off-road, around purpose-built tracks in California. The 1972 motorcycle racing documentary On Any Sunday is generally credited with inspiring the movement nationally in the United States; its opening scene shows kids riding their Sting-Rays off-road. By the middle of that decade, the sport achieved critical mass, and manufacturers began creating bicycles designed especially for the sport.

BMX (disambiguation)

BMX may refer to:

BMX (gene)

Cytoplasmic tyrosine-protein kinase BMX is an enzyme that in humans is encoded by the BMX gene.

Function

Tyrosine kinases are either receptor molecules, which contain transmembrane and extracellular domains, or nonreceptor proteins, which are located intracellularly. One family of nonreceptor TKs includes the genes TEC, TXK, ITK, and BTK. All of these proteins are homologs of the Drosophila Src28 TK and contain an SH3 and SH2 domain upstream of the TK domain.

Interactions

BMX has been shown to interact with:

References

Further reading

Bike

Bike may refer to:

Places

People

Vehicles

Art, entertainment, and media

Brands and enterprises

See also

Generic top-level domain

Generic top-level domains (gTLDs) are one of the categories of top-level domains (TLDs) maintained by the Internet Assigned Numbers Authority (IANA) for use in the Domain Name System of the Internet. A top-level domain is the last label of every fully qualified domain name. They are called generic for historic reasons; initially, they were contrasted with country-specific TLDs in RFC 920.

The core group of generic top-level domains consists of the com, info, net, and org domains. In addition, the domains biz, name, and pro are also considered generic; however, these are designated as restricted, because registrations within them require proof of eligibility within the guidelines set for each.

Historically, the group of generic top-level domains included domains, created in the early development of the domain name system, that are now sponsored by designated agencies or organizations and are restricted to specific types of registrants. Thus, domains edu, gov, int, and mil are now considered sponsored top-level domains, much like the themed top-level domains (e.g., jobs). The entire group of domains that do not have a geographic or country designation (see country-code top-level domain) is still often referred to by the term generic TLDs.

Bike (song)

"Bike" is a song by British rock band Pink Floyd, featured on their 1967 debut album, The Piper at the Gates of Dawn.

Information

In the song, Syd Barrett's lyrical subject shows a girl his bike (which he borrowed), a cloak, a homeless, aging mouse that he calls Gerald, and a clan of gingerbread men—because she "fits in with [his] world." With each repetition of the chorus, a sudden percussive noise is heard similar to the firing of two gunshots. Towards the end of the song, he offers to take her into a "room of musical tunes". The final verse is followed by an instrumental section that is a piece of musique concrète: a noisy collage of oscillators, clocks, gongs, bells, a violin, and other sounds edited with tape techniques, apparently the "other room" spoken of in the song and giving the impression of the turning gears of a bicycle. The ending of the song fades out with a tape loop of the band members laughing reversed and played at double speed. The song was written for Barrett's then girlfriend, Jenny Spires. She is also mentioned as "Jennifer Gentle" in the song "Lucifer Sam", which is also on The Piper at the Gates of Dawn.