There's nothing quite like the iconic sound of a classic Harley-Davidson engine, but longtime fans have noticed that sound ...

While major motorcycle manufacturers produce a wide range of impressive mainstream bikes, the custom-built world of motorcycles is far stranger, with some examples that seem to break all the rules.

The rumble and hum of a motorcycle is like a symphony to a biker's senses. It's proof that it's not just the wind in your hair or the thrill of the open road that makes an enjoyable ride. Far from it.