Joined: Jan 2008
Posts: 23,639
Likes: 1,106
From: Mans of NC & SW UT Desert
Bikes: 86 Katakura Silk, 87 Prologue X2, 88 Cimarron LE, 1975 Sekai 4000 Professional, 73 Paramount, plus more
Lots of variation in vintage bikes. I have one right now with a seat tube center to top of 50cm, and a top tube of 57cm center to center. I have another one with a seat tube center to top of 50cm, and a top tube of 50cm center to center.
Focus on top tube length.