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I used these tubes for several years with several different tyres, front was new, rear used. I've used them also with Panaracer Evo D tires wich are very rigid for a foldable tyre and even harder to fit than the Challenge and believe it or not, I've never got a flat. I will try with different tubes, you never know they might just be incompatible
alocalboy
@Squaredisk
diff tube + same tyre = see what happens
diff tyre + same tube = see what happens
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