There is one site that might help you with bike (and other) paths is [GPSies] 1 (Tracks for Vagabonds) which has a loot of nice features such as:
- web & mobile site available in 24 languages, metric/imperial system
- discover routes (supposedly 3,5 mil tracks) (by foot, by wheel, with animals, by motorcycle, on water, in winter...),
- browse/search recommended routes near your location for different activities (hiking, walking, cycling, mountain biking...),
- option to create, upload or edit your tracks and it works with following maps: Open Street Maps, Open Cycle Map, Sigma Cycle, Sigma Topo, Hike Bike Map, Google Maps, ESRI)
- last but not least are mobile apps for Android and Iphone. (I couldn't test them because I'm unfortunately on WP :D)
One thing I like is their route creator that seems easier to use than (for example drawing and exporting tracks) on Google Earth.