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Challenge Pro Cross & Gravel Seamless Latex

These inner tubes ride really great. Unfortunately, the workmanship is absolutely inadequate. I've already had a crack around the valve several times. The latex bulges there and it's not sturdy enough. Maybe they are sturdy enough for gravel bikes, as you ride with slightly more tyre pressure, but for cross, they are too fragile. If you plan to put these inner tubes on your crosser, I unfortunately have to advise against them.

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