Cast wheels are manufactured through a casting process where molten metal (primarily aluminium alloy) is poured into a mould to cool and solidify. As the most common wheel manufacturing method today, it features a relatively simple process and low production costs, making it widely used in factory-fitted OEM vehicles and the aftermarket modification scene.
Based on specific manufacturing techniques, cast wheels can be categorised into three distinct tiers:
| Type | Process Characteristics | Strength & Weight |
|---|---|---|
| Gravity Casting | Molten metal is poured into a mould relying purely on its own gravity to cool and form. While it is the simplest and most cost-effective method, the metal density remains uneven and internal air pockets may form, leading to relatively limited structural strength. | Lower strength, carrying a risk of cracking or fracturing under extreme stress. |
| Low-Pressure Casting | Consistent pressure is applied to inject molten metal into the mould. This ensures a more uniform molecular distribution and significantly fewer pores, offering superior strength compared to gravity casting. | Good strength, uniform density, and dependable quality, making it the standard manufacturing process for the vast majority of factory-fitted OEM wheels. |
| Flow-Form Casting | Using a pre-cast (gravity or low-pressure) blank, the rim barrel is heated and spun under high pressure to compress the metal structure. It essentially delivers "a cast foundation with forged-level performance". | Significantly enhanced strength and lighter weight, delivering performance close to forged wheels at a fraction of the cost. |
Cost Advantage: The straightforward manufacturing process is ideal for large-scale mass production, keeping prices accessible and offering excellent value for money.
Versatile Designs: Molten metal flows easily into intricate moulds, allowing manufacturers to effortlessly produce a wide range of aesthetic styling designs.
Performance Positioning: Readily satisfies all standard everyday driving requirements for safety and durability. Among these, flow-form casting offers the best balance between performance and budget—robust enough for light track day sessions, making it a top pick for budget-conscious car enthusiasts.