jim haseltine
Senior Retro Guru
When I was in my teen years the general rule of thumb was that a frame should be 10" smaller than the rider's inside leg measurement which put a lot of lads onto 23-24" frames. I used to ride 24" or 25" frames (I seem to recall I had a 26" Woodrup at one point) until I switched to continental manufacturers and longer cranks - I now ride 57cm centre-centre which translate to a touch under 23" in traditional British centre-top sizing.