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Ha. After I read about these on here the other week I immediately started searching lightweight tubes and discovered Tublito. I agree if they could make a 150g version, plus 40-gram tube, less 80 grams for sealant, less 4g (?) for the valve stem and you're looking at a weight penalty of 106g? That would be acceptable.
Do you think the extremely low pressure was also a factor in climbing rolling resistance?
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