One of the latest bike crazes is the Fixed-gear bicycle. Never heard of one? This type of cycle has one gear and cannot coast, since the pedals and wheels move simultaneously. If you want to see some phenomenal examples of this popular bike, check out Portuguese illustrator, Adams Carvalho’s Tumblr. He sketches some awesome pictures of men and women with their “fixies”. Some of Carvalho’s drawings show the bikes in motion, while others are simply drawings of people hanging out with their cool bikes. His prints are true to the bike, as he depicts each one quite simply, yet his male and female subjects are quite detailed. The contrast is striking and effective. Here are some of our favorites.