Some of the world’s fastest cyclists are in our state this week, competing in the the U.S.A Pro Challenge. These racers all have feather light bikes, skin tight clothing, and shaved legs. And these days, a lot of amateur cyclists do, too. Grant Petersen thinks that's silly. He’s the owner of a bike shop in the Bay Area. Petersen’s new book, “Just Ride,” seeks to remind people that bikes are supposed to be fun.