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@BringMeMyFix
PC-1s are rubbish. They oxidise the moment they're touched by human skin.
Sheldon Brown can wank on about chainsaw oil until the worms have picked his bones clean. Euro pros and they're mechanics have known for years that spunk is the magic lubricant, but have kept this knowledge closely guarded. When commentators talk about 'spunky riders', they're talking about the ones with very wet-lubed chains.
Jism has a high zinc content, and this provides a corrosion-resistant coating to links, roller, and pins of the chain. It reduces friction more than silicone based lubes, and Eddy Merckx's mechanic, when faced with particularly wet and muddy conditions for that week's Spring Classic, would often inform Eddy that it was a day for 'sloppy seconds'.
Izumi chains were originally manufactured by Pearl Izumi, but the company worried that the overt sexual slang in the brand name would 'let the spunk out the bag'.