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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Profile CranksPROFILE RACING BILLET CRANK ARM SETProfile Racing has been in the bike industry for a quite a while, but is a far more well known as a maker of expensive, well crafted, BMX racing frame and fork sets, cranks and stems. Many of you will remember their still produced Champ Pro frame and fork as one of the finest and most sturdy of your racing childhood. Profile makes these cranks using a CNC milling station. Each arm is cut from single piece of 7075-T6 billet aluminum. The arm is 1" (25.4mm) at the pedal spindle and gradually widens toward the B/B spindle where it is 35.5mm wide. A shallow groove is milled on the back of each arm to reduce unnecessary weight. The pedal spindle hole is drilled and tapped with 9/16" by 20 TPI threads. The crankarm cap hole is bored and tapped with 22mm x 1mm threads for the dust cap or crank pulling tool. The square tapered hole is milled with tapered sides as a part of the milling of the lower side. These arms are a low profile design, intended to be used with a B/B spindle that 107mm and 113mm in length. For that reason they have a slightly steeper offset in the 7 degree range so they will properly clear the chainstays. The spider is a great piece of machine work, again milled on all surfaces. The thickness of the aluminum that the inner bolts anchor into is a hefty 8.62mm, while the outer and middle bolt to a 3.5 mm thickness at the spider arm ends. The spider is fastened to the right arm by threading an aluminum collar onto a protrusion on the back. This collar is tightened using a pin spanner. Additionally the spider held by a steel bolt with a 3/16" hex fitting that is bonded in place once properly tightened. These cranks use the standard 110mm bolt pattern for the mid and outer chainring and 74mm for the inner chainring. We found the Profile Billet cranks had a Bike-Pro Q measurement of 175mm. The Profile arm set comes as right arm with spider, and left arm in five lengths, 170mm, 172.5mm, 175mm, 177.5mm, or 180mm. Chainrings, the fixing bolts and nuts, the inner fixing bolts, and crank arm dust caps will be needed separately. They come anodized in Blue, Black, Green, Lavender or Silver. The weight of a 175mm Profile crank arm set is 410.5 grams. Made in USA, specify length and color. Size-70-72-75-77-80 - Color-B-BK-GN-L-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... |
