I don't know the size but he said his dad owned the bike and they both had them, my coworkers bike got stolen and when his dad passed away he got the bike. He indicated to me that his dad was about my size so that would mean it this bike fits me it would have to be about 50 to 52 cm depending on the frame geometry. Like I said he didn't say he wanted to sell it but thought he might fix it up for his kid but that the kid probably wouldn't appreciate and just reading between the lines it sounds like he might take a reasonable offer for it. This all depends on the condition of the bike which as I said before he states its really nice with some light surface rust. the bike has chrome forks and chain stays but he couldn't remember it the seat stays were chrome. I really want lugged frame for my next project but if this thing is nice who knows. I'd like to get a ballpark figure for an offer and I think he said this bike was around $200.00 new