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.
But any bike under that weight cannot race in a UCI sanctioned race...if that's important to you. But I'm sure I could put Lance Armstrong on a Schwinn Varsity and he would still beat 99.99% of the riders here on the lightest bikes they could find. So 14.99lbs is minimum weight. Based on that fact, any bike under that weight requires weight added to race. Wouldn't the ultimate goal be to add that weight back in the form of additional strength, durability and aerodynamics.