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The Blackburn Mammoth Flex Mini-Pump is a compact, mountain bike specific pump that has a flexible hose for easy attachment at odd angles. A built in PSI gauge lets you dial in precise tire pressure on the trailside. This mini pump is specifically designed to push more air per stroke, saving energy that you might need for riding. The AnyValve pump head automatically detects between Presta, Schrader, and Dunlop valves. Max 50 psi. 222 grams.