Bicycles might be a green form of transportation, but they aren’t in vogue if they do not fall under the Boombox Bike category. These pedal-powered monstrosities come with a self-sustaining, built-in audio system that is bound to get audiophiles droooling. Meant to be rideable sonic assault vehicles, make sure the tunes you share with others are bearable – otherwise be prepared to just stick to your iPod and a really, really good pair of headphones. If you’re curious to know how to build your own Boombox Bike, check it out here.