The Tamiya TRF421X Chassis Kit is the latest high-end 1:10 scale 4WD touring car chassis from the Tamiya Racing Factory lineup. Developed with racing feedback, it features numerous enhancements aimed at achieving a lower center of gravity, refined suspension performance and superior chassis balance compared to its predecessor.

A newly designed aluminum motor mount positions the motor lower for improved weight distribution and more stable cornering. The 2.0 mm thick aluminum lower deck provides an optimized balance of chassis flexibility and rigidity. Two options for the upper deck (one-piece or two-piece) allow drivers to tailor chassis flex characteristics to track conditions.

Updated upper and lower suspension arms molded from carbon-reinforced nylon improve stability and durability under high grip and carpet conditions. New precision bearing-equipped drive shafts reduce friction and rotational loss for a more efficient drivetrain.

Fine-tuned pivot and Ackermann geometry, a choice of precision stabilizers, and added receiver and battery weights for improved balance complete the performance-oriented package.

Technical Highlights

• Scale: 1:10
• Drivetrain: 4WD belt drive
• Low-center aluminum motor mount
• 2.0 mm aluminum lower deck
• One-piece & two-piece upper deck options
• Carbon-reinforced nylon suspension arms
• Lightweight precision drive shafts
• Adjustable stabilizers
• Optional receiver & battery weights

Included

• TRF421X chassis kit
• Aluminum lower deck
• Aluminum motor mount
• Suspension arms & linkage parts
• Receiver and battery weight packages
• Hardware & assembly manual

Required (not included)

• Radio system with receiver
• Steering servo
• Electronic speed controller (ESC)
• Motor (brushless recommended)
• Battery & charger
• Wheels & tires
• Body shell