William Arias is a humble urban bike shop owner whose experience includes cycling the French Alps, the steep inclines of his native Colombia, and parts unknown in Mexico. And his shop, Willie's Bicycles, whose motto is "Ride in, ride out faster," delivers without fail. Whether it's a simple flat tire repair ($12 for the tire and labor), a complex overhaul on your fixie, or a fresh built-custom bike, Arias tells you how much it will cost before he starts work. Need a paint job, a tuneup, or some tricked-out accessories? Arias is your man. And he makes radical custom road and city bikes using your specs and his skills. He also imports his own carbon rims and builds each wheel set to order. In fact, he has his own line of Team Willie's Pros that will have you flying on the roadways like a speeding cannonball. As the official wrench of Miami Bike Polo, he's a hero to the local bike scene and a damn good mechanic who enjoys talking shop. He also offers rentals, sales on new and used bikes, and pick-up and drop-off service.