"What are the specifications of Barry's rims, and how do they differ from standard wheel retaining rings?"

There is no specific information provided about Barry's rims in the given context. Therefore, it is impossible to determine their specifications and how they differ from standard wheel retaining rings. Typically, rim specifications include dimensions such as diameter, width, offset, and bolt pattern. These specifications are crucial for ensuring compatibility with vehicles and ensuring safe and efficient operation of the wheels. Standard wheel retaining rings, also known as wheel nuts or lug nuts, are used to secure the wheels onto the vehicle's hub. They are typically made of steel or alloy and have a specific torque value that must be applied to ensure proper tightening. Without additional information about Barry's rims, it is impossible to provide a detailed answer to this question.