Product Details


In The Box
  • (1) 1/7 BIG ROCK Crew Cab 6S BLX 4X4 Monster Truck RTR
  • (1) Spektrum Firma 150A Smart V2 Waterproof* ESC
  • (1) Spektrum Firma 4074 2050Kv Brushless Motor
  • (1) Spektrum S665 Waterproof* Metal-Gear Digital Servo
  • (1) Spektrum 2.4GHz SLT3 Transmitter
  • (1) Spektrum SR315 3-Channel Dual Protocol Receiver
  • (4) AA Batteries
  • (1) BIG ROCK Crew Cab 6S BLX Instruction Manual Miscellaneous Tools


Needed to Complete
  • (2) 2S, (2) 3S, (1) 4S, or (1) 6S Hardcase LiPo Battery
  • (1) Compatible LiPo Charger
  • Maximum Battery Dimensions: 158 x 48 x 70mm (6.22 x 1.89 x 2.76 in)
  • Minimum Battery Specs: 5000mAh 50C

Download  ARRMA BIG ROCK 6S Manual HERE


Built on the proven 6S BLX platform and supersized to 1/7 scale, the ready-to-run BIG ROCK 6S BLX 4x4 blasts like only a large-scale ARRMA® RC monster truck can — especially when amped up with Spektrum brushless power and topped with an eye-catching crew cab body. Featuring loads of realistic scale details and "stealth" black-anodized aluminum parts, the ARRMA BIG ROCK 6S BLX is big, fierce, fast, and tough.

Its 6S LiPo capable brushless power system includes a highly efficient Spektrum Firma 2050Kv brushless motor that's perfectly matched to a Spektrum Firma 150A Smart V2 waterproof ESC with IC5® connectors. The ESC has been updated to deliver more punch and an improved driving feel. Install the supplied, optional speed pinion, and the BIG ROCK 6S BLX can reach incredible 65+ mph speeds in optimum driving conditions.

From the reinforced, black-anodized 6061-T6 aluminum chassis to the independent suspension with adjustable, aluminum-bodied, oil-filled shocks, the characteristically durable ARRMA design lets you fearlessly tackle all terrain and all conditions. The metal drivetrain, steel driveshafts, and metal-geared Spektrum S665 digital steering servo all work together to bring out the full bashing potential of 6S brushless power.

The BIG ROCK 6S BLX RTR's long, scale body marks the epitome of rugged truck style. An easy-to-use, clipless front body mount system preserves its incredibly detailed scale looks, and an integrated roll hoop and bed add more ARRMA toughness. Massive, vented dBoots® RAGNAROK V2 tires on five-spoke wheels complement the scale looks — and the tires' aggressive tread gets the grip you need for high speeds and easy handling over a wide variety of surfaces.

Assembled, finished, and complete with high-quality Spektrum SLT3 radio system, the ARRMA BIG ROCK 6S BLX RTR requires only your choice of the recommended LiPo batteries and charger before delivering big brushless performance with incomparable scale style.

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


  • Fully assembled and ready-to-run
  • Detailed scale looks with three factory-finished body color choices
  • Updated 6S LiPo capable Spektrum brushless power system
  • Black chassis components and electronics for aggressive stealth style
  • Easy-to-use clipless front body mount system to preserve scale looks
  • Integrated roll hoop and bed for bash-ready ARRMA® toughness
  • Powerful Spektrum S665 steel gear waterproof steering servo
  • Updated Spektrum Firma 150A V2 Smart ESC
  • Spektrum SLT3 3-channel 2.4GHz radio with SR315 DSMR® receiver
  • Black anodized aluminum chassis
  • Black anodized aluminum front and rear shock towers
  • Oil-filled black anodized adjustable shocks
  • Strong composite chassis side pods
  • Center body support and brace for maximum durability
  • Heavy-duty drivetrain
  • All-metal diff outdrives and gearbox internals
  • Durable steel driveshafts throughout
  • dBoots® RAGNAROK V2 vented tires with tough off-road tread pattern
  • Five-spoke wheels
  • Super-durable wheel hubs
  • 2-Year limited warranty (see website support for details)
Video Overview
Big Rock Dirt



The 1/7 scale ARRMA® BIG ROCK 6S BLX RTR monster truck is engineered for amped-up, high-speed blasting. It features a black-anodized aluminum chassis with strong composite side guards, center body support and brace for maximum durability. The heavy-duty drivetrain includes all-metal diff outdrives and gearbox internals. Durable steel driveshafts are used throughout.

Optional Light Set


The BIG ROCK 6S BLX RTR's long, scale Crew Cab body marks the epitome of rugged truck style. The clipless front body mount system is easy to use and remains concealed to preserve the detailed scale looks. Three factory-finished body color choices are available — Gunmetal, Red, and White. Factory light buckets make installation of the optional LED light set (ARA480075) quick and easy.



The tough, off-road tread pattern of the vented dBoots RAGNAROK V2 tires provides an aggressive grip for high speeds and easy handling on a wide variety of surfaces. The tires are mounted on stylish five-spoke wheels that complement the scale truck looks.



The adjustable, oil-filled shocks have black-anodized aluminum bodies and are mounted on black-anodized aluminum front and rear shock towers. The shocks keep the tires firmly planted for high traction and provide smooth travel over rough off-road terrain.

  • Superb SLT response rate
  • 50% and 75% throttle limited switch - great for beginners
  • Steering & throttle rate & trim adjustments with throttle and steering reversing
  • Foam steering wheel grip
  • Compatible with Tactic Receivers
  • Dual Protocol - Compatible with SLT and DSMR® 2.4GHz protocol transmitters
  • Fast reponse rate and outstanding range
  • No tool binding and protocol switching
  • SMART telemetry compatible
  • 3-Channels

With its strong metal gears and waterproof design, the included Spektrum S665 digital steering servo endures punishing off-road action through any surface conditions while delivering impressive torque (20kg-cm / 277.75 oz-in @ 7.4V) for confident control.


The BIG ROCK 6S BLX RTR's 6S-capable brushless power system consists of a highly efficient Spektrum Firma 2050Kv brushless motor matched perfectly to an updated Spektrum Firma 150A Smart V2 waterproof ESC with IC5® connectors (also compatible with EC5 connectors). In addition to offering Smart telemetry capabilities, the ESC has a new look, more punch, and improved driving feel.


Product Specifications

Ball Bearings Rubber-shielded bearings
Chassis 3mm Plate, 6061-T6 Aluminum
Completion Level Ready-To-Run
Drivetrain 4WD
Drive Type Forward/Brake/Reverse
Product Height 10.04" (255 mm)
Top Speed 65+ 105Kph
Wheel Hex Size 17mm
Motor Type Brushless
Speed Control Included
Product Weight 14.33lb (6.5kg) without Battery
Tire Tread dBoots® RAGNAROK™ V2
Vehicle Type Monster Truck
Water-Resistant Yes
Charger Sold Separately
Differential 3 Gear Diffs
Receiver Included
Shock Type Aluminum, Oil-Filled, Coil-Over Springs
Battery Sold Separately
Connector Type IC5
Motor Size 4074-2050Kv
Product Length 24.61" (625 mm)
Spur Gear 50T
Suspension Independent
Power System 6S
Product Width 18.31" (465 mm)
Radio Included
Body Painted, Decalled
Brakes Integral with ESC
Pinion 13T
Scale 1/7
Power Type Electric
Gear Pitch 1.0MOD
Servos Included
Wheelbase 16.61" (422 mm)
Barcode # 5052127044363
Brand Arrma
Shipping Weight 4.0000kg
Shipping Width 0.450m
Shipping Height 0.240m
Shipping Length 0.720m
Shipping Cubic 0.077760000m3

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