i see this as an old thread, but i had a TCR i bought new in '01
I never could get the sizing to work for me - had a medium and to ride it, i needed to use a conventional Dura Ace post as the stock carbon one was just too long (i found out later you could get shorter posts) -- then had to use a shorty stem that goofed up the handling
I think a medium was equivalent to a size 55 and my conventional steel bikes were all 53's or 54's
So it was close, but no bueno ------ even so, i got on a "weight weenie" kick with the bike and had it down to a ridiculous for the time 15 lbs or so ready to ride - it was a feather.