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Front Derailleurs


SHIMANO DEORE DX MOUNTAIN FRONT DERAILLEUR

The DX series of components was met an undue and untimely death from Shimano, when it was discontinued for the 1994 model year. DX is discontinued with LX expected to ascend to it's former position. We still have some these front changers available and in stock for people who still need them. The 92/93 DX front derailleur at 124 grams, (1 1/8" clamp), was slightly heavier then the 118 grams of the '91 model. This is because it included the adjustable return spring, while the 1991 model did not. The DX had the same sealed pivot points, and the same pantagraph mechanism as the XT. The clamp and link parts were made of forged aluminum alloy. The DX would accommodate any type of multi-speed chain, any shift system, and adjust the range of a 5, 6, 7, or 8 speed gear system. Installation and cable fastening was accomplished with only a 5mm hex wrench. The DX had a 26 tooth capacity. It was manufactured in three clamp diameters; 28.6mm (1 1/8"), 31.8mm (1 1/4"), and 34.9mm (1 3/8" band style). The clamp is natural colored, Silver aluminum with a Silver painted link arm, the cage is chromed steel. Intended for triple chainring cranks, it was also available in a top-pull style. No longer made, at the end of the 1993 year we were selling the DX front for $19.99 in the bottom pull and $23.99 in the top pull.





In-depth Information About Metals

Aluminum
Aluminum is extracted electrolytically from bauxite ore. It is made by the electrolysis of aluminum oxide which is found in larger concentrations within bauxite ore. Bauxite is a mixture of the hydroxides of aluminum, together with other impurities such as oxides of iron, titanium, and silicon. Bauxite is produced by the weathering and change of aluminum silicate rocks usually found in tropical and semitropical regions where climate has produced an accelerated weathering process. Bauxite is not a rare ore and is widely available in the US, the Caribbean, and Europe. Approximately 4 pounds of read the full article...

Beryllium
Beryllium is a specialty metal that is steel-grey metal in color, with an extremely low density, making it very light weight. At 1.85 grams to the cubic centimeter, its density compares to that of magnesium. It is also a high strength metal, making it possible to design light weight, thin membered parts with ahigh stiffness. A column made of beryllium to support a load placed directly downward on top of it, will have a greater load carrying capacity, and be lower in weight than any other metal of equal size.

Until the 1950's beryllium was used read the full article...

Titanium
The element titanium was discovered in 1763 by an English cleric, William Gregor who was an amateur chemist with an inquiring mind. It was in the black sands of Cornwall that he discovered the new element that had up to that time, attracted little scientific interest. A few years later, an Austrian, Klaproth, extracted the same element from an ore widely known as "rutile", which is a mineral consisting of titanium dioxide (one titanium atom, two oxygen atoms), that is a reddish-brown substance with a slight metallic luster. While rutile is the highest grade read the full article...

Metallurgic Hardness Testing
There are three types of tests used with accuracy by the metals industry,they are the Brinell hardness test, the Rockwell hardness test, and the Vickers hardness test. Hardness is the property of a metal which gives it the ability to resist being permanently deformed (bent, broken, or have its shape changed), when a load is applied. The greater the hardness of the metal, the greater resistance it has to deformation. Since the definitions of metallurgic ultimate strength and hardness are rather similar, it can generally be assumed read the full article...


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