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thinktubes, not a bad guess
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jeirvine thanks for more info
I've just watched a documentary about Coppi and Bartali. In some races they carry everything and in others just a water bottle. So the decline seems to be nonlinear (rules changed at different times in different races?). But at the end of their carriers it looks like they just carried water bottles. But I can be wrong on this, need more material.
There is usually a focus on the winners and the famous top riders. But when was the transition complete? When didn't even the last rider carry a frame pump?