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I found a 18 speed Roadmaster Neutron bicycle in much need of repair. The rear wheel & derailleur have been partially removed & are hanging loose by the side of the frame. I’d like to safely clean & reinstall correctly. Any advise would be appreciated.

The following guides show how to remove and replace the rear wheel of your bicycle: Rear Wheel ReplacementTrek 4300 Bicycle Rear Wheel Replacement And here are a couple guides to help you fix or replace the rear derailleur on your bicycle: Adjusting the Rear DerailleurHow to adjust Rear Derailleur Cables Though not your exact model, check out this device page for a Roadmaster bicycle that may be similar to yours. On that page you’ll find links to more guides that might come in handy as you repair other components on your bike. Hope this helps!