If you need to undertake adjustments for your Derbi DRD Edition 50 SM then it is usually a good plan to possess a Workshop Manual to use as a guide if you want to know the best ways to remove a particular component for instance the Brake Discs and match it again efficiently.
Derbi DRD Edition 50 SM Workshop Manuals provides identifiable diagnostic details for the car therefore if something is not working it will help you determine what the situation is and some ways to correct it. You will be able to assess if this can be done on your own or if the job is too big you can book your DRD Edition 50 SM in with a decent friendly mechanic.
Derbi DRD Edition 50 SM manual