I don't have a definitive answer, but I do think that the Lemond 853 frames were sized the same, except the Poprad CX bike. I have a labeled 2001 53cm Lemond Tourmalet, ST is about 51cm c-c and 54.5 c-t. I also have a labeled 52cm 2002 Poprad with the same measurements. The difference between the frames is the bb drop, with the Poprad having less drop. The Poprads are listed as 52 and 55, the the Tourmalet as 51, 53, and 55. I am guessing the size listing difference is due to the Poprad having less bb drop, ergo, the frame sits a bit higher.