If you wish to undertake auto repairs to your Derbi GPR 50 R then it is always a good idea to possess a Workshop Manual to use as reference in case you want to know how to strip off a specific part for example, the Wheel Bearing and install it again in the right way.
Derbi GPR 50 R Workshop Manuals can provide identifiable diagnostic details with regards to your car so if something is wrong it will help you work out what the issue is and some ways to correct it. You will be able to determine if this can be achieved by yourself or in case the job is too big it is possible to make a reservation for your GPR 50 R in to a suitable car garage.
Derbi GPR 50 R manual