If you wish to accomplish maintenance on your Norton Commando 850 Roadster then it will always be a good idea to have a Workshop Manual to use as personal reference if you want to know tips on how to take out a certain part like the Wheel Bearing and fit it again in the correct manner.
Norton Commando 850 Roadster Workshop Manuals gives you exact diagnostic wisdom for the automobile therefore if something is faulty it can help you find out what the situation is and some ways to repair it. Then you are able to decide if this can be done by yourself or if ever the job is too big you can actually book your Commando 850 Roadster right into a suitable friendly mechanic.
Norton Commando 850 Roadster manual