Rolled into sizing, if you are frame shopping, you should include tubing type. All my bikes are 64/60 but one is Reynolds 753, one is basic ChroMoly, and another is a Fuji variant. The larger the frame, the more you will noodle about if the tubing stiffness and diameter is not matched well. I have a 68cm Schwinn Voyageur 11.8. It really wobbles and noodles. Short guys have stiffer frames as the triangle is smaller. In the biking world, tall guys have a tough time due to frame size and rider weight. Just some thoughts as you shop your frame