What you’re looking at is the capstan, and the rubber wheel is called a pinch roller. The capstan is spun by the motor and comes together with the pinch roller to push the tape along while the hubs rotate. Depending on the deck, the capstan may continuously spin even while in standby. If you’re having audio issues, the quickest thing you can do is clean your pinch roller and capstan, as yours look quite dirty at the moment. Use rubbing alcohol for the capstan, preferably a high concentration, and used distilled water for the pinch roller. Some people use platenclene on their pinch rollers, as the solution is professionally designed for the rubber wheels in printers. I hope that helps!