I understood the question differently. (After all, we all are non-native speakers.)
Yeah, sorry for my poor english ;o)
I understood that Fabrizio wants to see just the MTB routes and nothing else. You are right! I am using mkgmap from a long time to produce a map of whole Italy, and for this works pretty well. Now I want to use it to produce another map with routes only (for example the routes you can see here: http://www.openstreetmap.org/?lat=45.8835&lon=10.7006&zoom=13&layers=00B0FTF), in order to overlap it to my existing map. I'd like to have different maps for mtb routes, hiking routes, cycleway routes and so on, in order to enable/disable it on my Oregon when I need it.
Can you please clarify and post some browse URLs, Fabrizio? Now I am dealing with entire Italy's dump, let me check it with a simple test data file I am building, so I'll be able to provide you more informations in the next days. Thank you! Fabrizio