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deda or columbus down tubes, reynolds are still too conservative with road tubeset wall thickness. Deda on all seasons, and columbus on R3. the columbus spirit tube is lighter, but can dent with a reasonable whack, which isnt suitable for the all seasons as it is supposed to be an audax ready, treat like shit while sleep deprived frameset.
I think Isen mostly use Reynolds and Deda downtubes, but there's only so many combinations of the available tubesets to go around. I'm in the process of ordering another couple of 38mm Spirit downtubes for my next build, and the last one had Max chainstays too.