Summer is just around the corner, and perhaps you’re dreaming of balmy mornings spent on a brand-new bike, speeding down quiet country roads under big blue skies on one of the best road bikes. Or ...

“Where are our helmets?” my daughter Harper asked. We were standing outside a cycle shop in the Dutch city of Delft, along with Harper’s older sister, Lyra, and my wife, Alia. “We didn’t buy any,” I ...