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They dont seem to degrade when they are in a tire. Iv got a bike from the 70s the tires got super dry cracked in the last few years but i run low pressure and tore off a valve stem. The tube was still nice so i just glued on a new stem from a bicycle tube. then put screws in the bead to keep it from slipping. But when i take old tubes out and let them sit in the shed a few years they get cracked and come apart easily.
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82 SC , 72 914
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