MICHELIN Airstop 26 x 1.6-2.1 Presta Valve Tube
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Details
The name Airstop says it all. Michelin's Airstop tubes use a proprietary butyl rubber so your tires stay up to pressure longer. And, the reinforced valve stem seam is ultra sturdy, too.
Weight: 196 grams (40mm); 198 grams (60mm)