...because we have no idea how ridiculous we look...or we prefer to not sweat through our cotton t-shirts and trousers...or because even though we don't race we like to wear cycling-specific clothing when we are on the saddle for six hours and the idea of having our nether regions chaffed raw is unappealing...or that we don't give a rat's ass about what judgmental folks think of us when we wear spandex.

Which is it?