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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Sampson Bottom BracketSAMPSON COLORADO Ti SEALED BOTTOM BRACKET
Sampson produces an inexpensive fixed spindle with dual adjustable cup bottom bracket. The spindle for the Colorado is made of machined Ti 6Al-4V rod. The spindle's 2 degree tapered ends slope to become the 17mm diameter needed for the interior of the bearing cartridge. A flat shoulder, with a 21mm height, rises for the bearing to seat against. The center of the spindle, between the two bearing cartridges has the diameter reduced to 17mm, for weight savings. The spindle has each end drilled to a depth of 23mm then tapped for the crank bolts. The bearing cups are machined from 2024 aluminum rod. Each of the cups are machined as a single piece and uses a lockring made from 3.04mm aluminum plate. Each cup has six 3mm diameter holes drilled in its exposed face for a B/B peg spanner (Park SPA-1 Green). The bearing cartridges are made in China (again, what was known as Mainland China) labeled "DF" and "6903-RS". The sealed cartridge bearings rely on eleven 4mm diameter steel ball bearings in a steel retainer within the steel inner and outer races. A removable, rubberized steel seal is pressed into each side. The bearing cartridges fit tightly into the cups. Careful tightening of the cups presses them over the bearings and seats them around the cartridges. The outer face of both the cup and the lockring are given a mirror-like high polish. Crank arm bolts are not included. The Colorado is available to fit a 68mm width B/B shell in these spindle lengths 103mm, 108mm, 112mm (172 grams), 116mm, 122.5mm, or 126mm. There are 108mm, 113mm, 122.5mm, 126mm made for 73mm wide shells. Also an Italian thread for a 70mm wide B/B shell is available in 112mm. The 108mm long version for the 68mm wide B/B shell weighs 160.5 g. 68mm shellSpindle length - 03-08-12-16-22-26 $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... |
