A few years ago, there was a "titanium" helmet on the market. A little digging revealed that there was titanium in the paint. As anyone familiar with paint pigments can tell you, TiO2 (titanium dioxide) is the standard to make white paint. Yes, the helmet was painted whiteMark McM said:Welcome to bicycle marketting 101.
Every material has both pluses and minuses, and so different materials may be more or less ideal for every component (or part of a component). For example, aluminum is easier to extrude and has a higher coefficient of friction than titanium, so aluminum is better suited to making rims than tititanium. Steel is harder than titaninum and more easily ground and polished, so it is better for making bearings than titanium. All the main bicycle structural metals (steel, titanium, aluminum) have about the same modulus/density ratio, so for components that need high stiffness in tension/compression there is no advantage between different metals, and material selection is based on other material properties. But because cross-section is important for bending/torsional stiffness, low density materials can be made oversized at the same weight, and the lower density aluminum may be more optimum for components that need high ratio of bending/torsional stiffness to weight than titanium. Some of these components include brakes, derailleurs, levers, and even cranks.stamp adams said:Thanks for the class! It is frustration. As I understand metalurgy, Titanium would seem to be a great metal to make the whole compnent from. Light weight, strong, non-rusting. All the reasons that I was interested in the Ti components. I think I will save my money. Thanks again. Big help. Stamp