Product description

Battery & charger choices

Battery and charger sold separately. Choose one 2S pack for a gentler starting setup or one 3S pack for higher performance.

Choose one charger: S155 G2 55W AC — budget choice or S2100 G2 dual 100W AC — charge two packs at once.

Battery choices: 5000mAh 2S 100C Smart G2, IC5 or 5000mAh 3S 50C Smart G2, IC5. Use one pack in the car at a time.

Battery + charger bundles: 2S PowerStage with S155 or 3S PowerStage with S155. A bundle already contains a charger; choose it instead of a separate charger.

ARRMA · ARA4312V4

Manuals & exploded views

Factory documents matched to this model and generation. Confirm the model number and any installed upgrades before ordering parts.

Instruction manual ↗Exploded views ↗Technical pack & parts reference ↗Open ARRMA resource library →

Factory part numbers are shown in the exploded views and technical pack where supplied.

Big Rock 4X4 V4 223S DSC 1/10 RTR Brushless 4WD Monster Truck w/Spektrum SLT3 2.4GHz Radio

Extreme Brushless Performance 2S & 3S - Big Rock

The updated Arrma Big Rock 4X4 V4 223S DSC 1/10 RTR Brushless 4WD Monster Truck comes ready to impress. With a redesigned body mounting system, powerful 2S and 3S capable electronics, and suspension to tackle every terrain, this truck is ready for action packed adventures. Grab your Arrma Big Rock 4X4 and experience the heart racing action extreme RC performance can deliver.

Clipless Body

Gone are the days of body clips sticking out and taking away from the scale detail that RC monster trucks can have. Arrma equipped this vehicle with a hidden, clipless body system. Simply press the tabs at the front and rear of the truck and lift up. Large side guards are close-fitting to the body to help ensure dirt and rocks keep out of the chassis.

Chassis & Suspension

The front and rear independent suspension combined with oil-filled, coil-over shocks soak up rough terrain. Adjustable turnbuckles allow you to fine tune the suspension for your driving style. Forthe drivetrain, the Big Rock is equipped with metal gear differentials, front, center, and rear, and durable splined driveshafts. The bearing-supported center driveshaft ensures smooth power transfer from the motor to the front and rear differentials.

Electronics.

This truck has been given Dynamic Stability Control to ensure that first time RC enthusiasts and seasoned pros can enjoy the extreme power this truck offers. The brutal 3100Kv brushless motor is powered by an 80A ESC and both are 2S and 3S capable. A metal gear and waterproof servo allow for smooth and powerful steering. The included Spektrum 2.4GHz transmitter allows for endpoint and trim adjustments on the fly.

Features:

Ready-to-run - just add battery and charger
Install a 2S LiPo battery for 35+ mph maximum speed
Use a 3S battery for 50+ mph top speed
Spektrum DSC (Dynamic Stability Control) and throttle limiting keep you in control
Stronger, ventilated composite chassis
Super-tough 4X4 drivetrain
Easy to use center diff module
All-metal gear center differential
Stealth monochrome electronics
Stronger all-terrain suspension

Includes:

(1) BIG ROCK 223S BLX 4X4 1/10 Scale Crew Cab Monster Truck RTR
(1) Spektrum SLT 80A 2-in-1 Waterproof ESC & Receiver 2S/3S with DSC
(1) Spektrum 3100Kv Brushless Motor
(1) Spektrum SLT3 2.4GHz Transmitter
(1) Spektrum S662 Metal-Geared 25T Waterproof Digital Servo
(4) AA Batteries
(1) Instruction Manual

Needed To Complete:

(1) 2S or (1) 3S Hardcase LiPo w/IC5 Connector
(1) Charger

Specifications:

Scale	1:10
Drive	4WD
Power Source	2S-3S LiPo
Length	20.24in (514mm)
Wheelbase	12.87in (327mm)
Width	14.02in (356mm)
Height	7.91in (201mm)
Weight	125.12oz (3547.09g)
Electronics
Motor:	Brushless - Sensorless
ESC	Brushless - Sensorless
Connector	IC5
Servo	Spektrum S662
Wheels
Front	2.8in
Rear	2.8in
Hex	-
Tires
Front	dBoots RAGNAROK
Rear	dBoots RAGNAROK
Assembly Level	RTR

Engineered for Speed. Built for Control.

Our RC vehicles and parts are crafted with cutting-edge tech and tested for durability. From high-speed drones to rugged RC cars and boats, every product delivers serious fun and unmatched reliability.

Performance You Can Trust

Join thousands of RC enthusiasts who count on ParkFlyers for top-tier quality, responsive customer support, and an unbeatable collection of parts and models.

Got Questions? We've Got Answers

What types of RC vehicles do you sell?

We offer a wide range of RC vehicles including airplanes, drones, helicopters, cars, trucks, boats, and a full selection of parts and upgrades for each.

Are your products ready to run (RTR) or require assembly?

Most of our models are RTR (Ready to Run) or RTF (Ready to Fly), meaning they include everything you need out of the box. Some kits may require minimal assembly—check the product description for details.

Do you offer replacement parts?

Yes! We stock replacement parts for most models we sell. If you’re not sure which part you need, contact our support team and we’ll help you find the right match.

How long does shipping take?

Orders typically ship within 1–2 business days. Delivery time depends on your location, but most customers in the U.S. receive their orders within 3–7 business days.

Do you ship internationally?

At the moment, we primarily ship within the U.S., but international shipping is available on select items. Please contact us for a custom quote.