If you have to do maintenance tasks on your own Derbi GP1 50 Racing then it is always a good idea to own a Workshop Manual to use as a reference if perhaps you need to know simple methods to remove a specific part much like the Wheel Bearing and match it again properly.
Derbi GP1 50 Racing Workshop Manuals offers clear unique diagnostic information for the automobile therefore if something is broken it helps you understand what the problem is and methods to make it better. You will be able to determine if this can be done yourself or in the event the job is just too big you can actually make a reservation for your GP1 50 Racing in to a suitable repair garage.
Derbi GP1 50 Racing manual