Thanks, guys!
I guess, adding to the confusion, is that many sellers don't seem to know how to measure properly/accurately.
There was a 56cm on Ebay- seller claimed that the TT was 58.5cm(!) and he gave a seat tube measurement as taken from center of BB to "middle"-
I'm pretty sure I'd be O-K with a 53 or a 55. -And I likely won't buy unless I get a good deal- so if it didn't fit, I should be able to resell it with little or no harm.
NICE bike, Mr. Mobile!!!!!! [drool]
I've never actually ridden one of these babies...but I've just heard so much good about them. Took my $300 BD bike for a short 15 miler today...and I'm still amazed at how well it ride- so I can only imagine what the Klein would be like! (Maybe I'm just easy to please- coming from only department-store bikes as a kid!)