Replace rear tire
Remove rear wheel from bike. Deflate tube by removing valve stem. Tire should remove easily by pulling rim of tire over the rim. IF difficult, take to local bike shop for assistance
How to grease suspension
Greasing is not usually done on this bike. If your need to grease it, you probably need a better bike. Contact your local bike shop
Do you have Roadmaster bike manuals
The only thing I can recommend is go to Walmart, ask them. Or look for a Roadmaster on their shelves, look for a website in the booklet hanging on thebike
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