Filter out certain types of path

I've just discovered this site and I am really impressed but is there a way to filter out certain paths? For example, I am looking for circular routes suitable for racing bikes only... and it keeps giving me (for example) routes with unpaved paths; and some of the cycleways are not `compacted' (i.e. they're muddy footpaths better suited for horses or mountain bikes!).... if I could put this rule in only for x,y,z paths then it'd start to be really useful.