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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Bottom Brackets Brake Systems
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Campagnolo Bottom BracketsCAMPAGNOLO RECORD STANDARD BOTTOM BRACKET
This is the more traditional of the two Record B/Bs using cup and cone construction with ball bearings. As you already know, Campagnolo has quite a reputation for doing things well. Some riders like to know the parts of their bike, specifically their bearing parts, intimately. A part of the reasoning is that points of high wear might indicate other problems with adjoining parts. Sealed cartridge bearings in trade for low maintenance, don't permit an examination of the internal ball bearings. High quality ball bearings of this sort, rather than sealed cartridge bearings, have demonstrably less drag, (just spin each spindle), absorbing less energy. This is considered the best user service-able bottom bracket available. The spindle is made of steel. Its two degree tapered spindle ends are machined not merely cast or forged. The bearing contact surfaces (cones) are precisely ground then polished, smoother may not exist. The spindle is hollow to reduce weight with threaded inner ends for crank bolts. Crank bolts aren't included because a few years ago Campy introduced a variation on Shimano's one key release designed crank arm caps/bolts. The bolts that come with the cranks incorporate an arm cap, arm bolt, and crank arm puller. The cups are machined from aluminum and has such a high polish, many people think they are made from steel then given a thick chrome finish. A separate steel cup race, ground and polished is pressed into each aluminum cup. This is not a floating B/B and uses a fixed cup on the drive side of the shell. The sides of the fixed cup are spaced for a 36mm fixed cup tool. The adjustable (left) is also superbly machined from aluminum, then highly polished, and has the same style steel race pressed into the cup. The adjusting cup has 6 holes in its face for peg/pin spanner installation. The chromed steel lockring is tightened with a hook spanner. The Record uses twelve 7/32" ball bearings in a steel retainer for each cup. Included is a clear plastic water sleeve. The standard Record B/B comes of in either Italian or English thread, its only spindle length is 111mm. The weight of the standard Record B/B is 224 grams. Thread-E-I $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... |
