Core though is a single speed drive train. Since it’s single speed, the only way to use the Earl is to peddle very hard. As such, the Earl has the benefit of also being a book bike for losing weight and/or building one’s leg muscles. For safety, the Earl includes a high grade brake system, fat tires, and a fat fender to ensure riders can stop at ease, and that also ensures the bike won’t fall apart in case a biker ever accidentally runs into a bush or car fender.