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I have the Sumitomos as well and have been wondering if they were ok to push at or above sidewall (running them ~45 now). I'll have to bring them up to 50 and see how they do. (just a pain to fill them with my craptastic pump)
Sans screws or other debris in the tire, mine have held fairly steady pressure for the last month. They went down 10 pounds from end of September to beginning of December as a comparison.
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