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Review title: Bad Valve Stem for 12-1/2"
Product review: These tubes are nearly impossible to accidentally puncture, but they fail in the 12-1/2 x 2-1/4" size because the stems are straight rubber. I tried to use them on a Trikke 12, and all of the stems tore after multiple refillings, since they have to be bent outward to attach a pump. What good is an indestructable tube with fragile valve stem?
