Reach BikePro on a 24 hour basis at 803-280-1537 Terry Dunbar is on duty as the technical expert, who also speaks Spanish as well as English and has quantities on hand information. Call her now for any questions about Bike Pro you may have.
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Reach BikePro on a 24 hour basis at 803-280-1537 Terry Dunbar is on duty as the technical expert, who also speaks Spanish as well as English and has quantities on hand information. Call her now for any questions about Bike Pro you may have. |
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American Mountain Stem
From St. Cloud, Minnesota comes the American Mountain stem. It's made of 6061-T6 TIG welded aluminum, then hand polished to a high luster. Where many aluminum stem makers actually use aluminum tubing to make their quill, the quill of this stem is from a piece of solid aluminum rod. The rod is drilled through, top to bottom, making 9.5mm hole for the expander bolt and the snug fitting recess for the expander bolt head. After drilling, the quill wall thickness is a massive 6.3mm leaving a very sturdy and rigid quill. The extension is large in diameter, and not ovalized. It is made of aluminum tubing, with a deep miter cut, so the extension wraps around the sides of the quill. The beefy aluminum binder tube is over three millimeters thick, uses a single binder bolt, and has a 25.4mm inner diameter. The binder fittings are machined from aluminum rod. The rod is drilled from both ends, to make the bolt travel hole, the recess for the bolt head, and recessed nut. The binder tube side of the fitting is given a half round shape so the piece contours the binder tube at time of welding. The nut side of the fitting has a serrated side, steel nut pressed into the fitting from the bottom so you needn't worry about threaded aluminum stripping out. As you can see from the images all the tubes and the binder fittings are TIG welded with broad bead. Even the binder fittings are massively welded prior to the front of the stem being sawn through, to create the binder cinch system. The expander bolt is made of chrome plated steel, is 120mm long, with a 8mm by 1.25mm thread pitch. The expander bolt has a 6mm allen head and weighs 45 grams. The binder bolt is made of chromed steel, has a 5mm allen head, with 6mm by 1mm thread pitch, and is 25mm long weighing 7 grams. The expander wedge is made from machined aluminum rod, which has been turned to the precise diameter, cut, drilled, and tapped. The American mountain stem is made in cable hanger cable. The entire stem is high polished, bringing the surface to near mirror-like quality. American stems are made in three lengths, 102mm, 121mm, 140mm. They are also made in 4 rises, 0 degree, +19 degree, +23 degree, and +30 degree. Any rise is available in any length, however these stems are, at the moment only available in the 1" size. A 19 degree rise version of the Mountain stem with the roller/stop guide routing, in the 140mm length weighs 319 grams. Specify length and rise. 0 degree (Length- 02 - 21 - 40) $ Price in Catalog |
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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... |
