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

There's something particularly engaging about the sounds produced by motorcycles. When a car sounds good, it does so through the insulating materials of windows and body panels. Or, maybe, you roll ...

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.