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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Onza Headsets
ONZA MONGO II ROLLER BEARING HEADSETThe Mongo II is made primarily of aluminum parts, incorporates added seals against outside contamination and a clamping mechanism on the headlock/upper cone race. The headlock nut also incorporates the upper cup cone race is machined of aluminum, with threads cut for the steerer tube. The top of the headlock is milled, delivering square edges for the headset wrench to grip firmly, but delicately. The clamping mechanism is performed by a cut running horizontally through the un-milled top of the head lock into the threads. A downward cut through the area through this area of this area makes a still-connected arm that comes in contact with the fork threads. This permits a small allen head bolt to screw through and draw the headlock nut tight on the steerer tube, securing the entire headset firmly. The lower side of the headlock has an aluminum race that rests over and seals the bearing cup, (which in this headset's case, is pressed into the head tube). The upper cup race is made from machined aluminum rod that's polished and machined to perfect the edges and surfaces. A groove is cut around it's upper lip with a stiff, porous, plastic seal inserted in it, giving added protection from dirt. The lower cup is also polished machined aluminum. The lower race is forged of aluminum. It's outer edge has a groove around the bottom of it for the plastic seal the upper bearings have. The Mongo II uses two stainless steel bearing races that slope from the center, down toward the outer edge, creating a beveled steel race that gives the roller bearing a full contact surface. These steel pieces lie on the aluminum "race" and in the cup, with a plastic retainer that holds 20 roller bearings which are 4mm long and 2.5mm in diameter, giving a long contact surface. This technique is used for both the upper and lower bearing assemblies. The Onza Mongo II is one of the items that Onza has made in the USA and comes in Silver or Black in 1", 1 1/8" or 1 1/4" sizes. The Mongo II weighs 126 grams in the 1 1/4" diameter. 1" (Color - BK-S) $ 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... |
