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Does anyone have a specification as to how much weight the self-sealing goop adds to the tire?
according to a 2013 press release, the goop only adds a pound per tire:

but this article talks about how they get the tire to have low rolling resistance. which may mean a heavier tire to get it stiff enough:
"For the Bolt, coming later this year, Michelin delivered what it calls its best tire ever, at least in terms of rolling resistance. That’s the tendency for a tire to deform, requiring more energy to keep it rolling. The less energy you expend there, the farther you go on a charge, making a stiffer tire optimal. The tradeoff, though, is comfort."
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