The fastest color would be the one that's most aero AND most aggro.
Enjoy the little things in life, for one day you may look back and realize they were the big things.
-- Antonio Smith
Vehicle colors should match the tradirional F1 national colors, before everything went to hell in 1968 or so. British Racing Green for British vehicles, silver for German, blue for French, red for Italian, white and blue for American, and white and red for Japanese. The perfornance of a vehicle is best when it has the appropriate national color. In the event of a car, it also sounds better.
(owner of silver German bike and silver German car)
Bianchi's Celeste green is by far the most adorable, but the fastest would go to black with a hint of deep purple at the curves.
~ "I like the way the brake cables come out of the top of the levers and loop around to the brake calipers!...I like those downtube shifters too!...No no no, don't take 'em off, don't take 'em off,...leave 'em on, leave 'em on! - Thats right baby!!
~BF - Steel Club Member #00051
Oaky I will confess that did own a red Cannondale CAAD 6 a few years ago and it was fast. But I have seen the light (or absence of light - whatever) and moved up to titanium.
BLUE is hands-down the fastest. This was established some time ago on the MTB forum; nothing has changed since then.
2005 Ritchey BreakAway (steel)
Full Campagnolo double compact drivetrain - Chorus 11sp
(50, 34 & 12-29)
Cateye CC-TR300TW V3
Ritchey fork, stem, headset, bars and seatpost
Fizik Gobi saddle and bar tape