Take your RC setup to the next level with the Tamiya 42391, a premium upgrade component designed for performance, durability, and precision. Engineered by Tamiya’s expert development team, this item is part of the renowned Hop-Up Options line, delivering race-grade quality for hobbyists who demand the best.
Crafted from high-quality materials, the 42391 ensures improved stability, smoother operation, and enhanced overall control. Whether you're fine-tuning your competition car or upgrading your favorite build, this component provides the reliability and performance edge needed to stay ahead.
Key Features:
High-precision construction for optimal performance
Durable materials for long-lasting use
Enhances handling and efficiency
Ideal for competitive and advanced RC setups
Genuine Tamiya quality and compatibility
Upgrade with confidence and experience the difference that precision engineering makes. The Tamiya 42391 is the perfect choice for enthusiasts who refuse to compromise on performance.
TRF421X Spec Images
2.0mm thick aluminum lower deck
• The new lower deck is molded in popular aluminum, and allows lower motor attachment position for optimum balance of chassis flexibility and weight distribution.
• Compatible with the TRF421 chassis kit when using new motor mount and 2.0mm thick aluminum lower deck together.
Drive shafts & drive train
• New front double cardan drive joint shaft and rear lightweight aluminum universal shafts feature bearings (Drive shafts used on the TRF421 chassis kit feature swing shaft caps.) to limit friction and speed reduction.
• The design and materials of front direct cups and rear differential steel joints are also changed. (Materials are changed from aluminum to steel.)
Aluminum motor mount
• Motor attachment position is 1.04mm lower than that of the TRF421 chassis kit for a lower center of gravity and more stable cornering, and a new design ensures accurate assembly.
Upper and lower suspension arms (new material) & front and rear damper stays
• Damper attachment positions are moved 1.0mm inside with new front and rear damper stays based upon the latest racing test results.
• Both upper and lower suspension arms are molded in carbon reinforced nylon (the TRF421 chassis kit features glass reinforced nylon) to ensure suspension flexibility and to improve stability on high temperature or high grip or carpet surfaces.
Upper deck
• Both types (one-piece and two-piece) of upper deck shape are updated for improved chassis flexibility.
• Compatible with the TRF421 chassis kit
Receiver weight & battery weight
• Newly added receiver weight (20g) and 0.6mm thick battery weight (30g) ensure optimum weight balance. Receiver weight is attached by one screw, and also works as cooling fan mount.
• Both receiver weight and battery weight are compatible with the TRF421 chassis kit.
