If you need to conduct repairs on your own Derbi Supermotard X treme then it is always a good idea to have access to a Workshop Manual for a reference in the event that you need to know easy methods to take out a certain component much like the Wheel Bearing and install it again the right way.
Derbi Supermotard X treme Workshop Manuals are able to offer special diagnostic guides for your vehicle therefore if something is not working it will help you find out what the problem is and some ways to fix it. After that you can evaluate if you can do this by yourself or that the job is simply too big you can actually book your Supermotard X treme right into a local mechanic.
Derbi Supermotard X treme manual