Wahoo Bike Pack

You use your iPhone for everything, so why not set it up as a cycling computer, too?  Using technology from ANT+, the Wahoo Bike Pack includes a bar-mounted, waterproof case for your iPhone and a wireless speed and cadence sensor. Linked up with Wahoo Fitness App, it tracks all your fitness data: power, bike speed, heart rate, etc., plus it connects wirelessly to any other ANT+ devices you’re already using.