So last night I bought a used Sea Breeze cruiser for my wife. See picture attached. I thought it was pretty good for $70 and she isn't much of a bicycle commuter - just something for random weekends. Anyways...I come to realize that when I place it upside down and pedal the back tire makes a chirping noise and wobbles a little bit. I drove it and it feels fine but it was a little concerning. Is there any easy ways to fix it or should i just pay $40 for a local bike shop to tune it?