I appreciate your figures, Rudi. This confirm that my impulse to go with a 42 mm tire is a better goal than settling for 650B and narrower, or 700 C and narrower still: maximize the wheel diameter and tire width too, for optimal result. Right now, my commuter has a 33 mm tire on the rear, and a 36 on the front, for this reason. I actually have two other frames that could be used for such a conversion: PX10 LE (no Nervex Pro lugset) or a Jeunet frame; but they're both 63.5 cm tall, with longer top tubes than the Int'l. So for the time being, I'm going to focus on the latter. I've wanted to have it repainted anyway, but before I commit to that, I need to figure out what else I want to do with it. I'm comfortable with 170 mm cranks, so I'm going to stick with that, too.