BMW 520 Coupe Rims, Size 20 Coupe Rims, Forged rims, not cast. The difference is explained below the ad. Rims in the style of Al-Naghi's import, suitable for Korean import cars. The rims are new, I ordered them from China intending to install them, but I decided to sell the car. They just arrived today in their boxes, unopened. Here is a breakdown of the main differences between them: 1. Manufacturing Method Cast Rims: Made by melting aluminum and pouring it into a custom 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 denting 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, they come as standard (OEM) with most cars. Forged Rims: Very expensive due to the complexity and cost of the manufacturing process.