Once upon a time, cars and trucks needed hubcaps to keep dirt and road crud from getting into the area where a wheel's hub encircles a vehicle's axle. Today, even the fanciest, most precisely machined rims still have a small hubcap, or grease cap, covering the stub end of an axle, but most of us probably don't think of these modest bumps as hubcaps. In the popular imagination, hubcaps were those flying-saucer-shaped platters that drew one's...Continue Reading