What is causing a roaring noise in rear of Mazda miata?

A roaring noise from the rear of a Mazda Miata could be due to several factors, including worn wheel bearings, a failing differential, or tire issues such as uneven wear or damage. Additionally, it might originate from the exhaust system if there are leaks or rust. It's essential to inspect these components to diagnose the exact cause and ensure safe driving conditions. If you're unsure, consulting a mechanic is advisable.