No, it’s not really necessary. But thanks to me posting pictures of my silly new FS bike, everyone and their cousin wants a curved seat tube. And so I spent a couple of hours this morning cursing a Supertherm 1/7/1×31.8 “seat” tube. Yes, you can curve butted tubes – but only if the center section is thick enough, which this one is. And it needed to be pretty beefy, this frame is a bit of a monster.
The toptube, too, is Supertherm, and the head tube is a big 44mm ID for a tapered steerer fork. All this big beefy tubing almost makes the Deda 30x16mm/1mm wall s-bend chainstays look wimpy (they’re not – not at all). The plan is to use some beefcake seatstays too, with rack mounts for adventure touring/Great Divide/etc.
Should be a fun all-around adventure bike. Here’s the relevant geometry for curious people:
-70 degree HTA with a 128mm head tube. Built for 100mm travel tapered steerer fork.
-75 actual/73 effective seat tube. 49.5cm/19.5″ curved. Neato.
-Clearance for 2.5+” tires.
-44cm chainstays (at the forward-most adjustment of the sliders), 315mm (12.4″) bb height.
-Supertherm tubes throughout, way beefy. For a 12×135 Maxle (Paragon sliders).
-S-bends, direct mount front derailleur (not on there yet!), rack mounts, 3 H20 cages, ready to rock for carrying a big load far from civilization.