Originally Posted by
noglider
And don't get hung up on 531. There are many other good sets of tubing that are light and strong and give a good ride. 531 is just the most famous. And for what it's worth, it's pronounced five-three-one, not five thirty-one, because it's a ratio.
Ooh ... did not know that. There's hardly anyone I talk to in real life about vintage bike stuff, so thanks for the pronunciation heads up.