If you want to perform adjustments for your Derbi X Race 50 R then it is always recommended to possess a Workshop Manual for personal reference just in case you want to know tips to remove a certain component for example Wheel Bearing and install it again perfectly.
Derbi X Race 50 R Workshop Manuals can provide precise diagnostic information for your vehicle therefore if something is wrong it helps you find out what the situation is and ways to fix it. After that you can assess if this can be achieved by yourself or if ever the job is simply too big you could make a reservation for your X Race 50 R in with a decent garage.
Derbi X Race 50 R manual