42389 1/10 R/C TRF104 Chassis Kit

Tamiya 1/10 R/C TRF104 Chassis Kit

Item number: 42389 / 300042389
EAN: 4950344423897


The regulation change of actual formula cars is now being planned in 2026 and the real formula world is a hot
topic!
To kick this formula world into gear in our R/C Line-Up, we are delighted to announce the release of the
TRF104 chassis kit which is a hi-spec 2WD formula R/C chassis.
It has been about 7 years since we released the TRF103 chassis (Item 42318).
This TRF104 chassis features updated front and rear suspension, plus an updated R/C equipment layout which is compatible with LF1100-6.6V batteries and Li-Po batteries.

About the Model:

• This is a 1/10 scale R/C model assembly kit. Length: 325mm (excluding front and rear wings), width:
169mm (front axle width excluding front and rear wheels), height: 46.5mm (excluding body mount).
• Comes with a dedicated carrying case or the TRF104 chassis kit.
• Please note that body, front and rear wings, motor, wheels and tires, R/C equipment, batteries for transmitter,
battery pack and charger are sold separately.

<<Updated front suspension>>
• Features plastic upper arms.
• Camber angle is adjustable freely from +1 to -3 degrees (approximate) with 2mm hex wrenches.
• Caster angle is also adjustable at 6, 9 and 12 degrees. (approximate). (How to adjust caster angle: ① Loosen
screws. ② Adjust upper arm mounts. ③ Tighten screws.)
*The TRF 103 chassis offers similar adjustment, but requires changing of camber adjusters.

<<Updated rear suspension>>
• Suspension link and T-bar setup is not used. Instead, ball connectors are equipped at motor mount front and
rear, and suspension roll is placed at the center of the chassis.
• The model centering is controlled by roll springs under rear shaft, and friction grease on roll dampers at
motor mount allow adjustment of roll speed.
• The pitching is controlled by FRP suspension plate flex and a TRF damper.

<<R/C equipment layout >>
Formula chassis can lose rear grip because of unbalanced weight. To prevent this problem, battery pack, receiver
and servo are positioned at the center of chassis to ensure better rear grip.

<<Compatible battery packs>>
• Compatible with LF1100-6.6V battery packs (middle size). (Not LF2200-7.2V battery packs.)
• The square-shaped battery holder is included for Li-Po battery packs to comply with overseas or open-class
regulations.

<<Motor mount>>
Motor mount has parts for adjustment of ground clearance and wheelbase: 5 types of ground clearances are
adjustable in 0.8mm steps and two wheelbases can be chosen with a difference of 2.5mm.
*The TRF103 chassis offers similar adjustment.

<<Steering servo & steering linkage>>
• The laid down steering servo is positioned about 30mm backwards compared to the TRF103 chassis, and
ensures a low center of gravity.
• Features a choice of 4 types of steering linkage adjustments over a range of about 1.8mm length by changing
ackerman plate position to keep direct steering.

<<Rear differential unit>>
Rear differential unit is the same as the one used for the TRF103 chassis. Lightweight and durable carbon fiber
shaft limits weight, and ensures compatibility with rubber tires which are relatively heavy.

<<How to attach rear wing>>
• A 2mm thick carbon fiber plate is used to attach rear wing. In this case, rear wing is connected to motor
mount and it moves along with rear suspension.
• When adding separately sold Item 53596 Aluminum Servo Stays (Short) as wing mount to attach rear wing,
rear wing is connected to suspension plate and it does not move along with rear suspension. (It remains
horizontal even if rear suspension moves.)　

.<<Front suspension arms>>
• 2.5mm thick carbon fiber front lower suspension arms have two attachment positions (3mm adjustment for
each side) to adjust its width and attach wheels with different offsets.
• If using separately sold Item 54153 (F103 Carbon Reinforced Front Suspension Arm) and 53119 (RD
Special King Pin Set), the width can be changed to the same 200mm width as the TRF 103 chassis.

<<Motor>>
Both brushless and brushed motors can be mounted. Use a kit-included aluminum motor plate to mount brushed
motor.

<<Bearing>>
The following sealed ball bearings are included.
• 1060 Sealed Flanged Ball Bearings (New) x2
• 4 pcs. from Item 42366 (1050 Sealed Ball Bearings (2pcs.))
• 1pc from Item 42377 (1150 Sealed Ball Bearings (2pcs.))
• 1pc from Item 42375 (1280 Sealed Ball Bearings (2pcs.))


This product is manufactured by:
Tamiya Inc.
3-7 Ondabara, Suruga Ward
Shizuoka, 422-8022
Japan
www.tamiya.com

Responsible in the EU is:
TAMIYA-CARSON Modellbau GmbH & Co. KG
Werkstraße 1
90765 Fürth
Fürth, Germany
www.tamiya.de