Tamiya's TRF R/C designers never rest. They are constantly looking to bring our most hardcore R/C racing fans the absolute best features able to be squeezed into a 1/10 scale touring car chassis! After two and a half years of development, Tamiya brings you the ALL-NEW TRF421. The highest end touring car chassis series produced by Tamiya has received a whole new suspension and layout makeover!
This 2-belt driven 4WD carbon fiber double-deck design is loaded with features such as an updated drivetrain, a new lower deck shape, front and rear upper A arms, and shorter dampers, all of which promise to translate into serious speed on the track! Other notable features include a choice between one- and two-piece upper deck layouts for different chassis flex characteristics, plus updated suspension geometry that keeps the chassis more stable.
Key Features:
- The Drivetrain uses a front direct coupling and rear oil-filled gear diff. Equal length front and rear drive belts minimize pitch.
- Suspension Arms are a rigid "A" design with 7mm longer span compared to the TRF420X for stable roll, while upper arm mounts can be slid to adjust camber.
- Three damper pivot positions are provided.
- Dampers are 5.5mm shorter than on the TRF420X, for a lighter chassis and lower center of gravity. Attach them directly to aluminum mounts and fine-tune with spacers.
Includes:
- A carrying case dedicated to the TRF421 chassis kit.
- Sealed Ball Bearings from the TRF series for efficient rotation
- Item 22078 Aluminum Differential Holders (0.8mm Offset, 2pcs.)
Required to Complete:
- 2-channel radio
- Low-profile steering servo
- ESC
- 540 motor
- Wheels and tires
- 190mm TC or Sports Car body
- 7.4volt battery pack and compatible charger.
Features:
- The drivetrain features the motor position moved 22.7mm toward the chassis center compared to the TRF420X Chassis Kit and has identical length front and rear drive belts for stable drivability.
- With updated setup of spur gear and drive belts, only one dedicated nut is required to attach spur gear, which enhances efficiency of maintenance.
- The lower deck is smaller compared to the one used on the TRF420X Chassis Kit to limit ground clearance when the chassis experiences roll.
- Choose from two types (one-piece and two-piece) of upper deck configurations. Changing screw positions allows five setup patterns in total.
- A-shaped suspension arms are employed for higher rigidity. (The 420X chassis kit uses I-shaped suspension arms.) Longer lower arm spans limit swing width and ensure stability when the chassis experiences roll.
- Along with longer lower arm spans, front and rear suspension setups are changed from suspension blocks to suspension balls. Roughly 7mm-longer arm spans limit swing width and ensure stability when the chassis experiences roll.
- Toe angle can be adjusted by uprights. (The toe angle of lower arm inside is 0 degrees.)
- Three attachment damper positions (inner, middle, and outer) on front and rear lower arms are offered by two types of aluminum bushings.
- Changing positions of upper arm mounts by screws allows changes to front and rear caster angles, which is suitable for current high-downforce races. Front caster available angles: 3, 4, and 5 degrees. Rear caster available angles: -.5, -1.5, and -2.5 degrees.
- Dampers are shorter by 5.5mm compared to the 420X chassis kit, which provides an exceptionally low center of gravity and reduces the weight, for a more dynamic driving experience.
- Dedicated damper ends are used front and rear to ensure the same piston level.
