For climbers, it's said that to be a top-level one, you should typically have a ratio of 2.1 or less.
And if you're above 2.4 you should try to avoid big climbs. That's from Joel Friel's "The Cyclist's Training Bible". I might have the numbers slightly wrong here as I don't have the page but it's roughly that.

You can see a list of all the Tour de France winners here and if you click on their links they give you their height / weight:
http://en.wikipedia.org/wiki/List_of...France_winners

Lance Armstrong was/is 5'9.5 and 165 pounds, which gives him a ratio of 2.37
Cadel Evans: 5'9, 150 , 2.17
Alberto Contador: 5'9.5, 140, 2
Carlos Sastre: 5'8, 130, 1,9
Oscar Pereiro: 5'10, 150, 2.14
Marco Pantani: 5'8, 130, 1,9

So yeah, not a lot of range. I'm sure you'd find similar numbers as you went through the entire roster of whoever was in the Tour over the last 20 years.
But hey those are the best of the best, anyone can achieve a pretty high level of ability through training alone. But if you're 7 feet tall, you're just not gonna win the Tour apparently, just like Danny Devito isn't going to the NBA before the next ice age comes.

Oh and me:
26
5'9
151
ratio: 2.19 ( 151/69inches)