Michael and Melissa Salvatore, the owners of Heritage Bicycles in Lake View, wanted a balance bike for their toddler. When they couldn’t find a design they liked, they enlisted the pros at their shop, which makes custom rides for adults. The resulting model was a hit with their son—but also with customers who wanted ones for their own kids. Brilliantly, the Salvatores created an offshoot retail operation to service the demand. Last October, they opened a milk and cookie/bike shop for tots, down the street from their original concept boutique—a coffee/bike shop for grownups.