Join Date: Feb 2009
Location: Deep in the heart of Texas
Bikes: Presto NJS build, Specialized Allez Pro w/ full Dura Ace and Ksyrium SLs, 1990something Specialized Sirrus
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A Pista is made out of steel, but it's not good steel, it's just your basic 4130.
Also, on any bike w/ nice steel tubing, the rear triangle is still going to be 4130. I don't know of any bikes that are completely 631 or 853 or w/e.
When looking at bikes, you should use the Seat Tube (c-c) as your measurement b/c ST (C-T) isn't as accurate. Most companies do C-C as well.
I think the Rush is a great frame, I just don't know if it will be much diff. than what you have now. If you need a new size, then go for it though. I do think that a carbon fiber fork would be your best bet, but if you really want a steel fork then get teh nicer tange model. I doubt you would ever have a problem w/ a CF fork, thoguh .