I’ve been looking around for a source for a tapered tube 34.9 → 31.8 as a down tube for lightweight road or gravel use. I see a couple of options in this size, but only in 600mm marketed as top tubes, most of my builds would need a longer tube than this. Am I missing something? What’s out there?
My build would be a 34.9/31.8 lugged bottom bracket shell with down tube tapered to a 31.8 lower head lug; 28.6 top tube; and seat tube tapering from 28.6 at the top to 31.8 at the bb. Lugs exist; bb shells exist; tapered seat tubes exist; but down tube?