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Titanium: New Technologies For Better Bicycles
The fourth commonest metal and ninth of the nine elements that account for over 99 percent of the mass of the earths crust, titanium is not exactly unobtanium, in spite of its reputation. But getting titanium out of the earth and turning it into cycle parts takes a gigantic amount of energy. Part of titaniums legendary appeal resides in the fact that its strength-to-weight proportion exceeds any other metal, and that it is very resistant to corrosion.
Named for the Titans of Greek mythology, the tensile strength of some common titanium alloys approaches that of high-strength steels and far exceeds that of aluminum, without being brittle. Maybe just as significantly, titanium, like steel and unlike aluminum and magnesium, has a fatigue limit, meaning that if the stresses are kept below that amount, it will never fail from fatigue. Its a high fatigue limit at that, thanks to its high tensile strength. The Youngs modulus ( rigidity index ) of titanium is around half that of steel, but so is its density. Titaniums density is high enough that tubes cannot be made as stiff for the same weight as aluminum or magnesium ones, because heavier walls are required to prevent buckling with huge diameter.
The anti corrosive properties of titanium are striking. Nuclear submarines are made from it so they wont corrode in caustic sea environments, and unpainted titanium cycles and elements simply dont rust. Titanium isn't crisp either ; it can be stretched around twice as far as steel and four times as far as aluminum before being permanently misshapen. This gives titanium frames survivability in crashes, since they'll be far more likely than others to spring back after impact. Finally, the ride of a titanium bike is often smooth, because a frame designer can select thin tube diameters and wall thicknesses to offer a supple ride without sacrificing longevity.
Due to titaniums ability to stretch and return to its original shape, drawing it into tubing demands bigger and more powerful machines than those required to draw steel tubes. Welding requires enclosure in an inert-gas atmosphere, and weld contamination must further be forestalled thru careful cleaning. Machining titanium requires very sharp tools and express speeds and lubricants ; copper-laden lubricants are used on titanium threads, and it is not counseled to thread titanium parts into each other.
Titanium excels for cycle frame tubes and dropouts as well as for light bolts, spindles and saddle rails.
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Volkl- Racetiger GS Racing Titanium Ski