Used tires are a significant global environmental issue, with millions of tires reaching the end of their lifespan annually. Tire recycling offers an innovative solution by turning used tires into a valuable resource. One promising application of tire recycling is as a reinforcing material for polymer composites. Tire powder with a small particle size (1–10 µm) has unique properties that make it ideal as a composite reinforcing material. The distribution of tire powder particles is crucial for optimizing composites. Smaller particle size improves distribution and interaction with the composite matrix. The range of 60–120 µm is the optimal particle distribution for dispersion and effectiveness on composite properties. Thermogravimetric Analysis (TGA) helps to understand the thermal stability and decomposition behavior of tire powders. The weight loss of tire powder increases with temperature due to thermal decomposition. Tire powder in air is more stable than in nitrogen, but the thermal decomposition of styrene-butadiene rubber is slower in air. Ground Tite Rubber (GTR) has a smaller weight loss compared to Dev-GTR and is more stable than Acrylonitrile Butadine Styrene (ABS) and Thermoplastic Olefin (TPO). Irradiation reduces the thermal stability of tire powder. Tire powder has lower thermal stability compared to Polyamide (PA) and PA/Tire composites. Recycling tires into tire powder has great potential to reduce waste and improve composite properties.