Copi BMW rims size 20 5 Series BMW 520 ‏ Forged rims, not cast The difference between forged and cast is in the manufacturing materials and process. 20 inch rim, width 9.5 rear Front 8.5 Same as original Forged is harder and stronger, suitable for our roads and potholes. Cast is suitable for smooth streets and is often affected by frequent potholes. Rims in the style of Al-Naghi import, suitable for Korean import cars. . Here is a breakdown of the most important differences between them: 1. Manufacturing Method Cast Rims: Made by melting aluminum and pouring it into a specific mold. Forged Rims: Made by pressing a solid block of aluminum under immense mechanical pressure and high heat. 2. Weight Cast Rims: Generally heavier due to the high density of the metal within the mold. Forged Rims: Much lighter (up to 25% lighter compared to cast), which improves the car's acceleration and stability. 3. Hardness and Durability Cast Rims: Very suitable for normal daily driving, but they can be prone to breaking or bending if exposed to a very deep pothole or a strong impact. Forged Rims: The metal structure is extremely cohesive thanks to the immense pressure, making them much stronger and more resistant to bending or breaking in harsh driving conditions. 4. Cost Cast Rims: Economical and affordable, and they come as standard (original) with most cars. Forged Rims: Very expensive due to the complexity and cost of the manufacturing process.