Arrma Kraton 4S BLX RTR 1/10 4WD Brushless Monster Truck (Red) w/STX2 2.4GHz Radio

Arrma Kraton 4S BLX RTR 1/10 4WD Brushless Monster Truck (Red)
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Price: $399.99
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The Arrma Kraton 4S BLX RTR 1/8 4WD Brushless Monster Truck is powered by the BLX120 brushless system, helping to create a truck that is unstoppable on trails, race tracks, and muddy courses. Its 2400Kv brushless motor is matched to an ESC with dual EC5 connectors for using two 2S LiPo batteries.

To develop the chassis, ARRMA engineers started with the proven 4X4 3S platform. They stretched the track width by widening the suspension and drive shafts, and added a center brace along the length of the chassis for maximum durability (it can be removed in just four quick steps when it's time to perform maintenance). The molded 16mm Big Bore shocks include top-loading springs and molded-in shock rod ends to prevent spring loss.

The body has the same aggressive styling as that of the KRATON 6S BLX, with a smaller version of its rear wing. There are also many subtle tweaks that give the KRATON 4X4 4S BLX a personality all its own. Large, tough wheels hubs and durable 17mm wheel hexes hold standard 3.8" wheels, outfitted with low-profile MINOKAWA LP tires.

Included with the ready-to-run package is a Spektrum STX2 2.4GHz radio with SRX200 waterproof receiver and an ARRMA ADS-15M metal gear servo. Just add your choice of battery, charger, and "AA" transmitter batteries – and start unleashing ARRMA monster speed and performance in a whole new size.



  • ARRMA® speed and toughness
  • 4S-capable BLX120 Brushless Power System for 50+ mph speed
  • Performance approaching the KRATON™ 6S BLX in a smaller, yet still beast-like setup
  • Spektrum™ STX2® 2.4GHz Radio System
  • 2-Channel SRX200 waterproof receiver
  • Built-in 3-position throttle limiter
  • Extended range and interference-free performance
  • Throttle/steering reversing
  • Throttle/steering travel adjust
  • Throttle limiting
  • ADS-15M waterproof metal-gear high-torque servo
  • 2400Kv brushless motor with large heatsink
  • BLX120 ESC with dual EC5™ battery connectors for two 2S LiPo packs
  • Lengthened suspension arms and driveshaft for wider track than 3S BLX vehicles
  • Center chassis brace for maximum durability
  • Metal spur gear and castellated slipper pads
  • Enlarged front and rear hubs for added strength
  • Durable 17mm aluminum hexes
  • 16mm big bore shocks with molded-in shock rod end and top-loading spring
  • Front and rear gearboxes with metal internal differential gears
  • New wing, wing mounts, and bumpers
  • New body mounts
  • Low-profile MINOKAWA tires
  • ADS-15M metal gear servo
  • 2-year limited warranty

*NOTE: For details on waterproof standards, please refer to the product instruction manuals.


Approximate Assembly Time: No assembly required
Ball Bearings: Full set
Batteries: One 3S, two 2S or one 4S hardcase LiPo battery (sold separately)
Body: Molded polycarbonate, trimmed and painted with decals applied
Bushing Material: Metal
Charger: Compatible with selected LiPo battery (sold separately)
Chassis: Molded composite
Completion Level: Ready-To-Run
Differential: Oil-filled metal gear
Drivetrain: 4WD
Final Drive Ratio: 12.48
Front Shock Spring Rate: 0.8N/mm
Gear Pitch: 0.8 Module
Ground Clearance: 2.28" (58mm)
Height: 7.56" (192mm)
Internal Gear Ratio: 2.85:1
Length: 20.79" (528mm)
Max Battery Dimensions: 6.50 x 2.01 x 1.89" (165 x 51 x 48mm)
Motor Size: 3668
Motor Type: Non-sensored brushless, 2400Kv
Pinion: 13T
Radio: Spektrum STX2 2-channel included
Rear Shock Spring Rate: 0.7N/mm
Servos: Metal gear steering servo
Shock Type: Oil-filled, coil over spring
Size/Scale: 1/10
Speed Control: BLX120 w/dual EC5 battery connectors for two 2S LiPo packs
Spur Gear: 57T
Suspension: Independent
Tire Diameter: 6.1" (155mm)
Tire Tread: dBoots Minokawa LP
Vehicle Type: Monster Truck
Water-Resistant: Yes
Weight: 7.99 lbs (3.63 kg)
Wheel Diameter: 3.82" (97mm)
Wheel Hex Size: 17mm Hex
Wheel Type: MT
Wheelbase: 12.87" (327mm)
Width: 15.55" (395mm)
  • (1) ARRMA KRATON™ 4x4 4S BLX Vehicle with
  • (1) Spektrum SRX200 Waterproof Receiver (installed)
  • (1) ARRMA® ADS-15M Metal Gear Servo (installed)
  • (1) ARRMA® 4S-capable BLX120 Electronic Speed Control (installed)
  • (1) ARRMA® 4S-capable BLX3668 Brushless Motor (installed)
  • (1) Spektrum STX2® Transmitter
  • (1) Product Manual

Needed to Complete:

  • (1) 3S/4S or (2) 2S LiPo battery setup with EC5/iC5 connector
  • (1) Appropriate LiPo balancing charger
  • (4) AA batteries for transmitter

This product was added to our catalog on May 3, 2019

Monday, Jun 24 2019 (about a year ago)
Arrma Kraton 4S BLX RTR 1/10 4WD Brushless Monster Truck (Red)
Being my first arrma car i did not what to expect.. and i am amaze. Shocks are so smooth and the chassi never almost bottoms out shocks doesnt leak at all like what i heard the 3s versions does. I had a lot of bad landing and so far no damage and driveshafts are completly intact. Wheelies like crazy on 3s slipper clutch was a bit loose out of the box 1/2 turn loosen from completly tightent
Friday, Feb 14 2020 (about a year ago)
Arrma Kraton 4S BLX RTR 1/10 4WD Brushless Monster Truck (Red)
I recently got back in to Rc. I sarted back when Vanessas Luchbox, cludbuster and the rustler where Kings... We've come a long way. Arrma has some great vehicles and this is one of them! The 4s line is VERY DURABLE and CHEAP to mantain. This thing is FAST, STABLE AND IT JUMPS GREAT!
The Rustler VXL doesnt even come close to this animal.
Watch the videos online and GET ONE!
Verified Owner
Monday, Aug 26 2019 (about a year ago)
Arrma Kraton 4S BLX RTR 1/10 4WD Brushless Monster Truck (Red)
This is a great truck! super awesome! Super fast and able to do crazy stunts! even on 3s this thing is fast. Find a BMX track and just send it!
Verified Owner
Saturday, Dec 21 2019 (about a year ago)
Arrma Kraton 4S BLX RTR 1/10 4WD Brushless Monster Truck (Red)
So far this is a excellent truck. I haven't run it yet just a little in the basement, but it looks
solid. The quality is great too. This is my first Arrma and won't be my last.
Friday, Mar 26 2021 (6 weeks ago)
Arrma Kraton 4S BLX RTR 1/10 4WD Brushless Monster Truck (Red)
Il me reste plus qu'à attendre pour voir si il est 3 étoile ou non.
Verified Owner
Friday, Aug 21 2020 (9 months ago)
Arrma Kraton 4S BLX RTR 1/10 4WD Brushless Monster Truck (Red)
Good RC Car .. Nice Model and good peformance .. I Like it ..
Verified Owner
Wednesday, Apr 15 2020 (about a year ago)
Arrma Kraton 4S BLX RTR 1/10 4WD Brushless Monster Truck (Red)
I have had nothing but traxxas brand rc's and they have been good and dependable. I wanted to try something different so I went with the arrma kraton 4s. I've had it for about a week and I've bashed it pretty hard and I'm very pleased with it so far. I would recommend arrma to anyone. Good cheap and dependable rc's thanks
Verified Owner
Sunday, Aug 25 2019 (about a year ago)
Arrma Kraton 4S BLX RTR 1/10 4WD Brushless Monster Truck (Red)
This truck feels super solid and it RIPS. Faster than my other brushless cars and handles great. Probably my favorite in my lineup now, it's my first arrma and definitely not my last.
Friday, Jun 14 2019 (about a year ago)
Arrma Kraton 4S BLX RTR 1/10 4WD Brushless Monster Truck (Red)
Keep your guard up on these trucks. The pinion may not be meshed correctly and need modifications. These share a lot of the same issues with the 3s trucks like leaky shocks to the point of being useless, a overly engineered and difficult motor mount and Rx Box design, a servo that is tested specs at 7.2v but run at 6v and is susceptible to glitching, as well as the possibility of needed upgrades rear driveshafts. Also this tire design is well known as crap on the big brother. -1 star for that alone.