I was wondering how the 05 and 06 Giant TCR and OCR composite limited compared to the other models of those years ie. the TCR and OCR composite 1, 2 and 3s. Which models are they most similar to, and what makes them..."limited"? Thanks for your help.

it has to do with the components the frames came with.

EXCEPTION to the rule would be the TCR Advanced - which most Giant owners agree are somewhat stiffer.

Your best bet is to go ask in the Giant forum.