For Ms. Wood of Boulder, Colo., that meant less time carting Sawyer in the car. In early August, Sawyer crashed while riding her e-bike without a helmet. “These kids don’t have driver’s licenses,” Ms. Wood said. They go really fast.”After news of Sawyer’s accident spread around town, Scott Weiss, a Boulder resident and parent of two teenagers, decided to sell the family’s two e-bikes. He said he would sell the e-bikes only to someone “college-age” or older: “I don’t want to sell it to someone who is not prepared to make the mental judgments you have to make.”

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Persons: Wood, carting Sawyer, Sawyer, Ms, Scott Weiss, ” Locations: Boulder, Colo