| 1020 | |
A high-tensile (Hi-Ten) carbon steel used on many bikes, including lower end 'bike boom' bicycles.
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| 3Rensho | |
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| 4130 | |
The designation for chrome-moly steel. 4130 Cro-Mo steel is higher grade than Hi-Ten steel but heavier than specalized tube sets such as 531 or Columbus SL.
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| 531 | |
A manganese/molybdenum steel alloy made by Reynolds. It was the undisputed leader in frame materials through the 1960's and was used on many high grade bicycles through the early 80's and on. 531 came in several variations including 531c and 531p.
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| 600 | |
Shimano's second-from-the-top (below Dura Ace) groupset for most of the '80s and '90s. This groupset eventually turned into what is now known as Ultegra.
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| 753 | |
Cold drawn, seamless butted manganese-molybdenum tubing most often used for racing frames. It is the same material as 531, but the way it is heat treated gives it different properties. Light and thin walled, it requires silver soldering. Probably the most well known 753 frame would be the Raleigh Team Pros. Dates from mid to late 70s into the 90s.
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| Accushift | |
SunTour's indexed shifting system. Introduced in 1986, but was rushed to production and caused additional loss of market share to Shimano.
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| Adapter Claw | |
The claw-shaped metal adapter for attaching a rear derailleur to a frame that does not have a built-in derailleur hanger. Usually stamped from a single piece of metal and threaded for the derailleur to be attached to. It is secured to the dropout by a small bolt with a special-shaped nut that fits in the back of the dropout's axle slot, and also by the rear axle nut or quick release skewer. Bicycles requiring these adapters are usually a sign of a lower grade frame, or possibly but less likely, a very old one before built in derailleur hangers become common.
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| Asymmetric Wheel Truing | |
Process of truing the rear wheel of a bicycle where the
spokes on the freewheel side of the rim are shorter and under different tension
that the spokes of the opposite side of the rim. Truing in this fashion is done to adjust for the width of the freewheel, to keep the
rim exactly on centerline of the axel.
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| Avocet | |
Company which made one of, if not the first, bicycle cyclometers--the Avocet Cyclometer 20. The Cyclometer 20 was introduced in 1985. Avocet has also produced saddles since 1977. The company still makes saddles, cyclocomputers, bicycle tires, and various other sports related items.
The classic The Bicycle Wheel Book by Jobst Brandt is published by Avocet.
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| Bar-end Shifter | |
A style of shifter which is usually mounted at the end of the drop section of handlebars. They are also mounted at the end of Aerobars on Time-Trial bikes. There have also been adapter-pods made which convert downtube-shifters into bar-end style shifters.
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| Barcons | |
SunTour registered name for Bar-End shifters.
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| BCD | |
Bolt Circle Diameter; a measurement of cranksets and chainrings.
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| Bianchi | |
Edoardo Bianchi started his bicycle manufacturing business in a small shop on Milan’s Via Nirone in 1885. They are the oldest bicycle brand still in existance, and since its beginning Bianchi has become one of the world's most respected bicycle companies. They are most often recongized by their trademark green color often used on their bicycle frames. This color known as Celeste, which is a unique teal blue/green color.
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| Bicycle Geometry | |
Bicycle Geometry: The several angles and measures that comprise the construction and configuration of the bicycle frame and fork. Different configurations are used to construct frames for touring, road racing, track racing, cyclocross, keirin, and other riding styles. See Wikipedia (URL: http://en.wikipedia.org/wiki/Bicycle_and_motorcycle_geometry) for a source on bicycle geometry. Key terms include: Fork Rake, Trail, Wheelbase, Fork Offset, and so forth. See also the Wiki Bike Geometry Project at URL: http://home.comcast.net/~pinnah/dirtbag-bikes/geometry-project.html, which is still under construction, but available.
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