The phrase "to swivel the wheels" means to turn the wheels of a vehicle or object around a central point, enabling it to change direction easily. Full definition
The highly manoeuvrable Baby Jogger GT has a lockable front swivel wheel with suspension for a smooth ride, along with a hand operated parking brake and adjustable handlebar. (babyandco.com)
The jogger contains special features like the front locking swivel wheel which allows the user to lock the front wheel in a still place and its reverse for easy low speed strolling. (strollerlab.net)