It is a 25 inch frame. I know that 61cm is 24", so this one is probably 63 about iin metric. One nice thing about being almost 6'3" tall is that it is easy to get tall frames as they dont' fit that many people, someone gave me this frame/fork, and a bit later gave me a Nishiki frame/fork the same size I made into a fixie. A neighbor gave me a 25" Ross ten speed, and I have been given other tall bike frames too. 25" is about the limit for me, although I have one old Paramount that is maybe 5/8" taller than that which works okay. This year I hope to build up a "Toaster mkII" using a tall later LeTour frame that is True-Temper butted main tubes, and I hope to put 700c rims on it so I can find used tires in bike-shop dumpsters easier. It is getting hard to find good used 27" tires anymore. I have a couple of tall Schwinn supersports, a tall huffy, a 25" Fuji an old friend gave me that he bought new in about 1972. After I kick the bucket my wife will probably throw them all in a dumpster.