Cycleways with surface=fine_gravel, shell(s) and compacted are considered now as "paved" which means they are not longer avoided in the bicycle profile on gps units with active routing and Basecamp (and also on the "car routing" in Mapsource, which was meant for racing bikes). Surface=gravel is often used on OSM but if the bike paths have a good smooth surface, better use fine_gravel.