Runtastic has their Runtastic Road Bike PRO (iTunes Link) for the iPhone and iPod Touch in the iTunes App Store for FREE (regularly $4.99) for a limited time.

The Runtastic Road Bike app, developed by road biking experts, turns your iPhone into a top GPS cycling computer with an array of incredible features! Track your tours, races and rides with your iPhone, monitor your training progress and compare your performance to your friends’! Become a part of the Runtastic Community with millions of enthusiastic users.