The distinctive colour isn't gold plating, but hard-wearing and slippery titanium nitride. The aircraft grade stainless steel at the cog's core is subjected to multiple heat treatments, and the complex tooth profile provides both optimum chain engagement and minimum friction. It is the cog of choice for Jamie Staff, Chris Hoy and Bradley Wiggins, and every one comes in its own colour-coded wallet. Um, did I undersell it?
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