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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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Panaracer Dart TiresPANARACER SMOKE DART TIRESIn 1992 Panaracer introduced the Dart series of tires. Using the same manufacturing techniques as the Smoke series, these tires are well constructed and Panaracer recommends they be used as front tires. Darts come in two types with each having four models. The Dart H.C. is nominally sized at 26 x 2.10". The H.C. stands for "Hard Conditions" intended for pavement or hard packed dirt, the tire is said to made of softer rubber that provides added stickiness or traction, now being called "Sticktion". Remember softer rubber compound is generally achieved by including less carbon black in the rubber prior to vulcanization. The second type, the Dart S.C. is nominally sized at 26 x 2.20". Naturally the S.C. stands for "Soft Conditions". The tire is said to be made of a stiffer less abrasive rubber so it "gives" less as the riders weight is pushed into soft material (mud or sand). The Dart S.C.'s greater width gives a larger tire patch to load the weight across. Both the Dart types are made in Skin or Black sidewall with steel or Kevlar beads. The Dart H.C. tire relies on a tread block pattern that repeats approximately every two inches around the circumference of the tire that is based on elongated triangles pointing forward on these directional tires. The triangles come in two sizes 15mm long with a 5mm wide base and 20mm long with a 5mm wide base. At the top of the tread pattern there are two of the small triangle blocks spaced approximately 5mm off the center line of the tire. Behind them by 15mm are two more spaced 12.5mm off the tire centerline. Between the rear two on the centerline is one of the larger triangles, which closes up the open space between the triangular tread blocks. Small angular "hockey stick" shaped blocks are used for the side tread blocks. There are two on each side beginning half way down the small, front triangle blocks, extending a third of the distance into the rear set. To link the pattern, a thin rectangular side tread block is placed between each pattern set. The Dart S.C. uses the same triangle shapes in a slightly different pattern. The small triangles are spaced the same distance from the centerline, but the two rows are separated by 35mm with one large triangle centered between them. Smaller triangular blocks placed at a forward angle make up the side tread blocks, with two of them on each side between each rectangle block. The side tread blocks give a near vertical surface to the tread on the side. The measurement for section width and crown are the same because the crown extends slightly past the sidewall. The thread count and casing fabric for these tires is unknown. |
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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... |
