Q-Tubes 650b/27.5"" Diameter Presta Tube These 650B presta valved tubes (screw top) are replacement tubes for your 650B wheels. Keep a few spares around to be prepared for a flat! 32mm valve Presta valve Removable valve core...
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I had various tubes from Quality, but Q-Tubes Standard 650B/27.5 in. Presta Tube be the high-grade!
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