We may receive a commission on purchases made from links. Motorcycles grow more powerful with each passing year, with engines like Indian's Power Plus 108 and Harley-Davidson's new 2.1-liter Screaming ...

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.

Motorcycles grow more powerful with each passing year, with engines like Indian's Power Plus 108 and Harley-Davidson's new 2.1-liter Screaming Eagle IV V-twin putting out 122 and 130 horsepower, ...