I have been cycling since early childhood; it is more of an obsession for me. Not long ago, I discovered a great way of pairing my iPhone with my bike rides, and there is no end to what I can have on the go. With apps for sports and fitness installed on my iPhone, I get real time data on my bike performance metrics. Bike speed, distance travelled, time consumed, bike cadence, heart rate all are there just a click away. You can also enhance your smart phone experience if you get sports and fitness applications on your iPhone.
BUT, I have never used any such application. If you have any relevant experience, help me out!