That'a hard problem I spent some time thinking about and helping. I contributed to OSM surface type on roads. But we certainly lack publicly known user friendly software to mark surface for OSM and then to plan for your bike type. I am happy that work is ongoing, but unhappy with how hard it still is.
And certainly vwru unhappy when people help siloed maps and not shared ones like OSM.
And certainly vwru unhappy when people help siloed maps and not shared ones like OSM.