They’re putting their mettle to the pedal. Biking in frenetic Brazilian traffic can be terrifying: 1,300 cyclists die there each year. For women, who represent a small percentage of riders, it’s even more intimidating. Facing sexual harassment and other indignities — especially at repair shops — some are now responding by joining all-female cycling groups. They offer solidarity and safety in group rides, while training members to know their rights and fix their bikes. One organizer’s even planning a cross-country ride, hoping to build a social media movement along the way.