Bike2Power has just added an iPhone 5s version to their line of ruggedized, weather-sealed BikeConsole Smart Mounts for bicycles. The lineup already has a version for the 5 and 5c, but the new 5s model allows access to the Touch ID fingerprint sensor.
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UPDATE [We said the case is available for the iPhone 5, which it isn't.]
BikeConsole addresses the single biggest problem with using your iPhone as your in-bike computer: battery life. The iPhone clearly makes for an awesome brain for your bike, with maps, GPS and all manner of bike and fitness apps available, but leaving it running up there with the GPS and screen burning is a great way to kill your battery, fast.
So the BikeConsole does the obvious thing: it adds a battery.