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Drop Style Handlebars - OverviewThese are the conventional that we have historically seen on road bikes. The Drop bar is frequently made of a single piece of aluminum alloy tubing with either a bulged center for the stem to grip or there is tradition of using a separate "sleeve" as a tubular shim to increase the diameter to that needed by the stem. The "Drop" is the descending circular grip at each end of the bar. The Drop style has two commonly referred to measurements. The first is the "width", this the distance on center between the circular descents or "drops" at each end of the handlebar, this is measured in centimeters, (1cm = 10mm). The second question frequently tries to reference whether the bar has a "steep" or "shallow" drop. Steep or shallow are relative terms. We will measure the drop from the center of the "top" (the area parallel with the riders shoulders) of the handlebar to the center of the straight uncurved portion of the lower drop. We did not measure the "reach" of the Drop bars, which is traditionally measured from the center of the top tubing section to the center of the downward curve at its front most. The reason we haven't included this measurement is that it varies when the bar is installed on the bike, based on how the bar is rotated, up or down, before tightening. |
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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... |
