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@Squaredisk
'Hermetic' tubes arrived. They feel probably twice the wall thickness of standard Conti tube (Cross 28 on left in picture). I weighed Cross 28 = 170g, weight of Hermetic = 225g. Other than that not much visible difference. I was expecting a totally smooth tube as in the picture on the box, but the surface just looks like a standard tube. They supposedly have a different butyl mix than standard tube. They would be bulky to carry as spares and would be much bigger than a Tubolito.
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