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I tried these for the first time yesterday and I was very impressed. It seems that the insert creates an air pocket similar to Schwalbe's Procore, but that chamber has four valves that allow it to compress. More later but ride one was very encouraging. Install was a snap as well. The weight of the tubed version was a deal-breaker for me, but these weigh less than most tubes and may allow you to go down in weight for both rims and tires.
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