Be prepared for all kinds of bike tire problemsbring the Serfas MP-3 Power Stick Mini Pump, a patch kit, and a spare tube along when you ride. This mini pump with a large PSI gauge has a dual valve head so you pump up your own tubes with Presta valves and can help out Joe Schmoe, who didn't come prepared, inflate his tubes with Schrader valves. A high-low switch on the Power Stick lets you customize inflation speed.
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