Tamiya RC 1/10 TRF421X Chassis Kit 4WD High-Performance Touring Car

(Available from the Warehouse)

Description

Tamiya TRF 421X RC Car Electric 4WD 1/10 Scale Kit

This R/C model assembly kit creates the 2 belt-driven 4WD TRF421X, the latest model in the line of TRF chassis; it has been tuned based upon racing feedback, and offers superior drivability and cornering performance. Its double deck layout is composed of a 2mm thick aluminum lower deck and carbon fiber upper deck. With a new motor mount, the kit enjoys a lower center of gravity and optimized flex. Fine-tuning of suspension material gives stability in high temperatures or on high grip surfaces, in conjunction with 1.2mm and 1.3mm stabilizer bars. New knuckle arms’ front Ackerman position gives more direct steering, while the hole on the rear arms moves adjuster rod attachment positions backward for optimum grip on low traction surfaces. Drive shafts have swing shaft caps with ball bearings to limit friction and speed loss.

Developed for serious competition use, the Tamiya RC 1/10 TRF421X Chassis Kit takes the TRF421 platform to an even more specialised level. Its updated two-belt 4WD architecture combines a lower aluminium motor position, a 2.0mm aluminium lower chassis deck, revised upper decks and carbon-reinforced suspension components to produce a low, rigid and highly tuneable platform for high-traction racing surfaces.

Please note this is an unassembled kit requiring assembly; it ships as a build-it-yourself kit and does not arrive pre-built or ready to run.

The Tamiya TRF421X RC On-Road Chassis represents the peak of touring car engineering, designed specifically for those who demand the highest level of performance on the track. This 2-belt 4WD racing powerhouse builds on extensive race data to provide a platform that handles high-traction surfaces with incredible precision. With a revised layout that lowers the motor position and optimises weight distribution, every lap feels more composed and predictable even as speeds increase.

Finding the perfect setup is a breeze because this kit offers a wide range of tuning options, including adjustable knuckle arms and precision stabilisers. The combination of an aluminium lower deck and carbon upper deck creates the ideal balance of chassis flex and rigidity for competitive racing. This chassis is the real deal for anyone looking to push their driving skills to the absolute limit because it is built to handle the heat of top-tier competition.

The TRF421X moves the motor 1.04mm lower than the standard TRF421, while revised suspension arms and damper stays provide additional flexibility and stability on hot, high-grip and carpet tracks. Precision stabilisers, aluminium dampers, adjustable chassis weights and two selectable upper-deck configurations give experienced racers an extensive range of setup possibilities.

New Features

• 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 contemporary design ensures exact assembly.
• 2.0mm thick aluminum lower chassis deck: The new lower deck is made of aluminum. It allows lower motor attachment position for optimal balance, chassis flexibility and weight distribution. NOTE: Compatible with standard TRF421 chassis if the new aluminum motor mount is uséd in conjunction.
• Upper Chassis Deck: Both types (one-piece and two-piece) of upper deck shape are updated for improved chassis flexibility. NOTE: Compatible with standard TRF421 chassis.
• One-piece upper deck attachment: Tubes, dedicated titanium low button-head screws and shims are uséd to attach the one-piece upper deck. Adjust flexibility by using 0-0.3mm shims. NOTE: Compatible with standard TRF421 chassis.
• Upper and lower suspension arms (new material) & front and rear damper stays: A- Damper attachment positions are moved 1.0mm toward the inside with new front and rear damper stays. B- 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 hot temperature or high grip or carpet surfaces. NOTE: Compatible with the standard TRF421 chassis kit when changing both damper stays and suspension arms.
• Drive shafts & drive train: A- New front double cardan drive/joint shaft and rear lightweight aluminum universal shafts feature bearings (Drive shafts uséd on the TRF421 chassis kit feature swing shaft caps.) to limit friction. B- The design and materials of front direct spool cups and rear differential are changed. (Materials are changed from aluminum to steel.
• Upper arm mounts: New upper arm mounts feature 1mm narrower pivot attachment width for improved cornering response, and upper arm attachment with bushings to adjust pitch. A modern design helps ensure exact assembly and stability under vibration. NOTE: Compatible with standard TRF421 chassis.
• Knuckle arm: New knuckle arms feature new hole positions for front and rear, respectively. The hole for front makes Ackerman position outward for more direct steering and the hole for rear makes adjuster rod attachment positions backward for best rear grip on low or middle traction surfaces. NOTE: Compatible with the standard TRF421 chassis kit. When using knuckle arms included in the TRF421 chassis kit, 4 setup options (2 choices for front and rear respectively) are available depending upon road surface and driving style.
• Stabilizers (sway bars): Precision stabilizers can be chosen from 1.2 diameter (x2) and 1.3 diameter (x1) depending upon road surface and driving style. NOTE: Compatible with the standard TRF421 chassis kit.
• Receiver weight & battery weight: Newly added receiver weight (20g) and 0.6mm thick battery weight (30g) ensure best weight balance. Receiver weight is attached by one screw and works as cooling fan mount. NOTE: Compatible with the standard TRF421 chassis kit.

Special Features

• 1/10 scale high-performance 4WD touring car assembly kit.
• Two-belt driven 4WD drivetrain designed for high-traction track conditions.
• Aluminium motor mount positions the motor 1.04mm lower than the standard TRF421 for a lower centre of gravity.
• 2.0mm thick aluminium lower chassis deck provides a precise balance of chassis flexibility, rigidity and weight distribution.
• One-piece and two-piece upper deck configurations allow different chassis-flex characteristics.
• Carbon-reinforced nylon upper and lower suspension arms provide controlled flexibility for demanding track conditions.
• New front and rear damper stays move damper attachment positions 1.0mm inward.
• Precision stabilisers include 1.2mm and 1.3mm options for different track surfaces and driving styles.
• 20g receiver weight and 30g battery weight help optimise overall chassis balance.
• Oil-filled rear gear differential and direct-coupler front drivetrain provide competition-focused power delivery.
• Full ball bearings, adjustable suspension and aluminium TRF dampers are included.
• Designed to be compatible with selected standard TRF421 components and setup parts.

What's in the Box

• Unassembled TRF421X chassis kit components
• 2.0mm aluminium lower chassis deck
• Aluminium motor mount
• One-piece and two-piece upper chassis decks
• Carbon-reinforced nylon upper and lower suspension arms
• New front and rear damper stays
• TRF aluminium oil-filled dampers
• Precision stabiliser bars
• 20g receiver weight
• 30g battery weight
• Front direct coupler and rear oil-filled gear differential
• Front double-cardan shafts and rear universal drive shafts
• Full ball bearings

What You'll Need

• 2-channel radio
• Low-profile steering servo
• ESC
• 540 motor
• Wheels and tyres
• 190mm TC or Sports Car body
• 7.4volt battery pack and compatible charger