From competitivecyclist.com's Pegoretti write up:
In fact, all of the Niobium tubing Pegoretti uses is one-off. He insists that Columbus take the extra step to heat treat the tubes for him. While the stock version of the tubes has very good elongation qualities and thereby provides a nice bit of shock damping, heat treating them gives them a considerable increase in responsiveness under a load. Think of it this way: While a spring is springy by nature, a heat treated spring rebounds from compression far more quickly. In other words, a heat treated Niobium Spirit frameset will provide superior elasticity, making a Pegoretti feel like it's gliding on a lousy road surface to an extent unmatched by other tubesets.
Is that steel the same as Columbus Pegorichie? I beleive I read that Pegorichie is Columbus Spirit manufactured specifically for lugged construction, which leads me to my next question: Is this tubeset also marked as Columbus Spirit Keirin? Given that most Japanes Keirin framesets are lugged, I wondered if they would want the same characteristics in a tubeset.
Is Pegorichie available to all framebuilders who use lugs, or only the two of its namesake? I would love a frame built of that heat treated Columbus, as I ride every day through the city, rain or shine. However the practicality of having a Lugino 'street fixed' is not looking good.