One of the key accessories every cyclist should own is a bicycle pump. Before you head out for a bike ride, ensure that your tires are inflated to the recommended PSI, which is listed on the tire's sidewall. A properly inflated tire reduces the risk of a flat tire or a pinch flat while you're riding, and also helps the tires function properly and safely.
Valve Compatibility
There are several types of pumps from which to choose. Most cyclists prefer to carry a mini pump or a frame pump on their bike and keep a floor pump at home, as it tends to be heavy and bulky. Regardless of the type you choose, make sure it has the proper head for the type of valve your bike tire has. Valves come in either presta or schrader. If you're unsure of what pump will be available at your event, consider buying a small adapter so you can inflate the tire using either type of pump. Many pumps are adjustable and are compatible with both kinds of tires.
Weight and Durability
Typically cyclists want to keep the weight of their bikes and accessories low so they can ride faster. When buying a frame pump or mini pump, consider the weight it will add. A mountain biker carrying a pack on the trail has more room for a larger, more durable pump that can withstand the forces of rocks and roots, compared to a road racer that carries everything in her pockets. When choosing a floor pump, weight isn't as big of a factor. Look for a pump that contains some metal parts and is durable. This pump will be your day-to-day workhorse. If you're going to splurge, do it here.
Performance
When buying a pump, consider the speed at which a tube change is required. If you're bringing the pump to a race, consider buying one with a maximum pressure output. Check to see how many strokes it takes until the tire is inflated up to its proper PSI. Some pumps feature dual chambers which inflate a tire in half the time. Also, check that you can achieve the PSI you need to with that specific pump.
Other considerations
Most floor pumps are equipped with air gauges and many mini and frame pumps also come with an air gauge. This is not only helpful for reaching the exact tire pressure you desire, but it also saves the time used going back and forth between an air guage and a pump. Constantly switching between the two puts excess stress on the valve stem, which can lead to a slow leak or tear, eventually resulting in a flat tire.
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