Everybody's too fat for this sport. I read recently that nobody in the TdF weighed more than one kilogram (2.2 lbs) per inch of height, and most are at 2 pounds. I'm 6'4", in reasonable shape, and I need to lose 85 pounds....
But my confession is that all bikes look about the same to me: Wheels on the ends, tubes in the middle; if I can't read the label I can't tell the difference.