It means calm and reserve to me, perhaps coupled with a careful observation of one's manners. It's not exactly a manner of dress or speech- more a way of behaving. Bashfulness and modesty doesn't bring anything but good.
The Rca frame and basic hardware weigh less than 1.5 pounds, keeping the bike's total built weight to about 10 pounds. Tour de France riders must add ballast to hit the race's 15-pound minimum. Drag consumes up to 50 percent of a racer's energy when he's in a pack, 90 percent when he's riding alone. The tubes of the Rca frame are teardrop-shaped in cross section, improving aerodynamics.
Tour de France must adapt to survive as crowd size threatens its future. The incident on Mount Ventoux which cost Chris Froome his bike caused chaos and debate and now it is imperative the Tour addresses its constant growth. Chris Froome forced to run up mountain in stage 12 of Tour de France. Tour de France 2016.