Opinions and also value judgments are our own, uneven otherwise noted-- Sheldon (d. 2008), Harriet, John.Additions and also corrections are many welcome.

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B-Tension mediate Shimano terminology because that the screw the regulates the stress and anxiety of the upper-pivot spring of a rear derailer. It need to be adjusted with the bike in its shortest gear. Loosening this screw allows the jockey pulley to swing increase closer to the cluster, boosting shifting.

If the B-tension is too loose, however, the jockey pulley will bump into the biggest rear sprocket, resulting in noisy running and possible shifting problems.

See my post on Derailer convey for more information ~ above this and also other derailer adjustments.


Back-pedal brake british term for coaster brake. Round Bearing A round bearing is a kind of bearing in i beg your pardon the turning component is linked to the non-turning component only through balls that roll between the 2 parts. Sphere bearings are supplied in bicycle bottom brackets, freewheels, headsets, and hubs. They are additionally occasionally provided in derailer pulleys and brake calipers. Round locking system A device using bearing balls come lock a sun equipment to the axle in a planetary gearing system, offered in some Sturmey-Archer internal-gear hubs.


The Bead seat Diameter is the fundamental dimension used in the ISO/E.T.R.T.O. System of tire and also rim sizing. This is the an excellent virtue of the system, compared to all of the older equipment that referred to the tire's external diameter, with no certain reference to rim diameter or to the rim/tire interface.

See my tire Sizing post for details. Bearing A bearing is the point of contact between a turning part and a non-turning part. A great bearing assembly has tiny or no play, and also as small friction together possible.

Major bearings top top a bicycle are the headset, the bottom bracket and also the hubs. Over there are additionally bearings in brakes, pedals and also freewheels.


Bearings supplied in bicycles room usually that the cup-and-cone type, yet many newer bicycles usage cartridge bearings.

Bearing sphere A steel round that is part of a round bearing assembly. Many front hubs use 10 3/16" balls on every side; most rear hubs usage 9 1/4" balls on every side. Many bottom brackets usage 11 1/4" balls on each side.

Bearing balls room made in batches, and also within a batch the size is an extremely carefully controlled. Native one batch come another, however, there can be a significant variation in actual size of balls of the exact same nominal size. For this reason, balls from various batches should never be combined in the same bearing.

Bearing balls come in several quality grades, designated by numbers. Grade 25 is the finest that is available for bike applications. Qualities 100, 200, even 300 are commonly used in bicycles.

Bellcrank A linkage in the form of a right-angled lever, with the pivot in ~ the corner. Shimano 3-speed hubs (and some Sturmey-Archer 5-speeds) usage a bellcrank to translate a pull on the gear cable into a press on a loose-fitting pushrod that fits right into the axle. 

Belt journey from time to time toothed belts are proposed as an different to chain drive. A belt might be lighter 보다 a chain, despite the pulleys are broader and so, heavier than sprockets because that a chain. The significant advantage touted because that this system is the it is cleaner 보다 a chain.

There are serious disadvantages come this approach, however:

Belts can't be opened and also re-closed together chains can, so the is not possible to to the right one come a traditional diamond frame, uneven you reduced the framework open, since the belt has to be looped through the triangle formed by the best chainstay, right seat stay and seat tube.Belts can't be lengthened/shortened as chains can, make it challenging to customize the gearing through going to a different sprocket/chainring size.Belts bend rather of pivoting, and are less effective than chains.Belts space stretchy. To prevent skipping, they need to be maintained tensioned, more reducing efficiency.Belts can't be made as small as chains, so they do not lend themselves come derailer gearing.

As through shaft-drive systems, all of the services touted for this device are also attainable v an enclosed chain drive.

Also watch R&E Cycles comment on belt drive for the tandem synchronizing chain.

Bendix A really old company, originally known as a maker of coaster brakes, but later diversified right into the automotive industry, where they are particularly involved through starters. (The retractable drive equipment on an automotive sprocket is generally called a "Bendix gear".) The firm is still going strong, however the bicycle division was marketed off part years ago.

Benelux A defunct British maker of derailers. These were famous in the middle of the 20th century. Benelux rear derailers supplied a telescoping assembly and conical return spring, and attached to the chainstay. Derailers with a pantograph (parallelogram) system replaced these. 'Bent Recumbent bicycle or tricycle. Bento box A little box strapped come the optimal tube and also handlebar stem, typically carrying food. "Bento" is Japanese for "box lunch". Bidon French term because that a water bottle. Bike Noun: bicycle; motorcycle. Numerous cyclists object to verb-based derivatives that "bike" i.e. "to bike", "biking", "biker"...(Bikers journey Harleys, civilization who drive bicycles room cyclists.) Bike eight In the early-to-mid 1970's, bicycle sales boomed, after ~ several decades when the bicycle was generally regarded as a child's toy.

The Bike boom was partially related come the infant Boom, as Boomers were beginning to enter adulthood in big numbers. Other determinants were the popularization the 10-speed derailer-equipped bicycles, and increasing environmental awareness, v the hope that bicycling would certainly substitute for lot motoring. The bike eight is regularly attributed to the oil dilemm of 1974, yet in fact, the was currently waning then -- see data in 1978 examine republished by john Allen.

A similar bike eight had developed in the mid-1890s as soon as the safety bicycle through pneumatic tires changed the high-wheeler.

It is essential to differentiate bicycle sales from bicycle use. As bicycles are long lasting goods, a cycle boom tends to saturation the market and then come be complied with by a bust. The actual level of bicycle usage are much more stable.*****

Billet A solid chunk that metal, generally in the form of a slab or a item of cylindrical stock. Commonly cut right into usable parts by CNC machinery. Binder Bolt
an additional name because that a pinch bolt, usually offered to describe the seat-post bolt.

Binder bolts are likewise commonly offered to clamp handlebars into the handlebar stem, and, in the situation of threadless headsets, come clamp the stem to the fork steerer.

Blackwall tire most tires use rubber combined with carbon black, which makes the tread more durable and also improves traction.

In the 1950's, some tire providers started utilizing "gum" rubber (without the carbon black) because that the sidewalls, in the interest of enhanced flexibility and lowered rolling resistance. Later, "skinwall" tires became popular, tires with almost naked cloth sidewalls, with simply a bit of rubber to hold the cords together. For countless years, tan sidewalls, whether gum or skin, were a authorize of high-performance tires, and also blackwalls to be a sign of cheapness.

In the early on 1990s, there was a styling fad for tires i m sorry were basically skinwalls, but looked prefer the old blackwalls. Although the marketing departments of tire carriers tried to make this out together some sort of advantage, the is fundamentally a styling issue, as with whitewalls.

tongue Block "Brake block" is another term because that a brake shoe or pad because that rim brakes. Block Chain an obsolete form of chain, formerly famous with monitor racers.

Block chain had solid blocks as inner links, without rollers. It had actually a 1" pitch with 3/16" large blocks, the exact same as the "skip link" roller chain that appeared on the market about 1930 to replace it.

The staying stock of block chain was coveted by track riders who believed it to be the only chain strong enough to stand up to their imagine strength. When the stock of block chains lastly ran the end in the so late 1970's, it was replaced by 1/2" pitch 3/32" vast chain, as provided with derailers, although track riders still choose a 1/8" vast chain, believing they are stronger than various other riders. MTB's with 22 tooth granny chainwheels produce several times the chain tension any kind of track rider deserve to muster.


An 8-tooth sprocket for 1" key chain (left) is tantamount to a 16 for conventional 1/2" chain.

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BMX bike Motocross, a type of dirt-track racing, mostly for children and teenagers. Competitors usually ride 20" wheel, single speed bicycles v a freewheel and a rear hand brake. Races, referred to as "motos" normally last much less than two minutes, and feature jumps. High-level BMX races mainly hinge on getting a good start off the line, which, for some reason, is called a "hole shot" BMX tracks usage mechanical beginning gates that autumn forward under the riders' wheels once released.

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