OD44.5mm down tube
Damn, that's fat! Who makes it?
Spindly little 38.1 on mine
Columbus make a couple of 42mm down tubes including one from the 29'er tubeset in 750mm length (which is probably half as long as you'd need)
My DZB tube was only available up to around 750mm on the Talbot and barely made it. The Isen was able to use it as the Pinion plate extended the reach
@PhilDAS started
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Damn, that's fat! Who makes it?
Spindly little 38.1 on mine