Tamiya TRF421X Steel Front Direct Cup Joints (2)

Drive Cup Overview:

The Tamiya TRF421X Steel Front Direct Cup Joints are replacement drivetrain components designed for the TRF421X and also serve as a durable optional upgrade for the standard TRF421. Made from steel, these front direct cup joints provide added rigidity where the drivetrain experiences the most load.

About the Steel Direct Cup Joints

Durable Design

These cup joints increase durability and reduce flex in the front drivetrain, supporting smoother power transfer and improved consistency during high-grip on-road racing. The included aluminum collars and hardware simplify installation while maintaining a precise fit within the TRF421-series layout. Their reinforced construction helps the chassis handle aggressive acceleration and cornering forces, making them a reliable choice for racers seeking long-term performance and stability.

Features:

• Steel construction increases drivetrain rigidity
• Reinforced design supports consistent power transfer
• Aluminum collars support secure installation
• Enhances long-term drivetrain stability