At the Fond du Lac Cyclery store owner Bart Hallgren says e-bikes are becoming a hot commodity."There has been a high demand for them," Hallgren said. "So probably about half of our bike revenue we get is e-bikes."But with the rise in popularity, has come a rise in criticism.Some cities like nearby Neenah are passing ordinances around e-bike usage. Limiting use in certain areas and outlawing motor usage when on sidewalks.And it's not just bikes.…