Losi Lasernut U4 4WD Rock Racer Brushless RTR R/C w/ Smart, AVC (Blue)

By:team losi
Quantity: Only 1 left in stock.




The TEN 4WD platform is recognized all over the world as the personification of strength and durability.


The Losi® Lasernut U4 1/10-scale 4WD Rock Racer (RR) RTR with Spektrum(TM) Smart builds on the TEN design and adds items rock racers demand such as aluminum shocks, sway bars and adjustable turnbuckles. Plus, it includes a full metric hardware package for worldwide compatibility. The Lasernut is currently the only complete Unlimited U4 FIS (Full Independent Suspension) racer on the market featuring all the technological advances drivers demand including the Spektrum Firma Smart 130A Brushless ESC and Spektrum Firma 4-Pole 1900kv 550 motor providing greater efficiency improving run times with increased power. Of course, the ESC is waterproof, completely programmable and comes pre-wired with a high-current IC5(TM) connector. Drivers stay in control with a DX3(TM) transmitter, a Spektrum AVC® receiver with steering priority, and an officially-licensed Lasernut race-inspired scale U4RC body/roll cage with two different graphics and color variations. Working together with BFGoodrich Tires, the Lasernut U4 has scaled down KM3 tires that have an aggressive tread pattern capable of handling any terrain. The Losi Lasernut Rock Racer is the ultimate U4 racer with scale looks, insane speeds and performance, and Spektrum Smart Technology.



  • TEN 4WD Platform
  • Spektrum(TM) Firma(TM) 130A Brushless Smart ESC and 4-Pole 1900kv 550 Motor
  • Spektrum DX3(TM) 2.4GHz radio system with AVC® and optional telemetry
  • Waterproof Components
  • 12mm race inspired threaded aluminum bodied shock absorbers and shock caps
  • Officially-licensed Lasernut Racing Scale Body & Cage
  • Officially-licensed BFGoodrich® Mud-Terrain T/A® KM3 Tires
  • Officially-licensed Raceline 2.2 Wheels
  • Sway bars
  • Three Oil Filled Gear Differentials


Legendary TEN Platform

The legendary, high-performance TEN platform features a super-tough aluminum chassis and the ability to adjust the Lasernut U4 independent suspension and drivetrain for any condition.

Officially Licensed Scale Body and Roll Cage

A Lasernut Licensed race inspired scale U4RC body/roll cage with exciting graphics offered in two different color variations with a flip up cage for easy access to the battery.


Officially Licensed Wheels and Tires

The included scale licensed Raceline 2.2 racing wheels and BFGoodrich KM3 tires featuring an aggressive tread pattern that handles any terrain and good looks while out on any course.


Waterproof Electronics

The Lasernut U4 is loaded with waterproof electronics including the receiver, servo and ESC. Everything is sealed against the elements allowing you to splash in the rain, spin in the mud and make tracks in the snow. It's full-throttle freedom to run anytime, rain or shine


LED Light Bar and Pod

The fun doesn't stop even when the sun goes down with the Lasernut U4. A brilliant LED lights on the integrated light bar cast more than enough illumination for running at night. The pod lights are amber.


Independent Front and Rear Suspension

The front and rear suspension provide amazing handling with a consistent feel and the ability to soak up bumps. It all adds up to a buggy that's dialed in for maximize performance right out of the box.


4x4 Driveline with Adjustable Differentials

Full-time four-wheel drive provides increased traction and handling. The front, center (aluminum) and rear differentials can also be tuned for various conditions.


50+ MPH Firma Motor 50+ MPH Firma Motor

The brushless Spektrum Firma 4-Pole 1900kv 550 Motor will provide excellent power (50+ MPH) with a 4 cell Lipo (not included).


The Full-Throttle Freedom of AVC® Technology

The receiver's built-in AVC® (Active Vehicle Control®) traction control system works behind the scenes, making hundreds of throttle and steering adjustments per second, so more of the motor's power is translated into ballistic speed and acceleration instead of just flying dirt. The patent-pending AVC system adds a level of performance that simply cannot be found with any vehicle from any manufacturer other than Horizon Hobby. Like traction control in your full-scale vehicle, you can activate or deactivate the system on the fly and adjust the level of stability based on driving conditions. Any RC vehicle can go fast and with AVC you can go faster while maintaining optimum stability in all driving conditions.



  • Product Weight     Varies with equipment
  • Vehicle Type     Rock Racer
  • Water-Resistant     Yes
  • Chassis     0.12" (3mm) thick 6061 T-6 aluminum
  • Ball Bearings     Full set
  • Drive Type     Forward/Brake/Reverse
  • Drivetrain     4WD
  • Completion Level     Ready-To-Run
  • Make     ARMADA
  • Product Height     8" (203 mm)
  • Front Track     13.25" (336mm)
  • Vehicle Size     Standard
  • Product Width     13.25" (337 mm)
  • Radio     Included
  • Technology     Smart,AVC
  • Bushing Material     Metal
  • Charger     Sold Separately
  • Differential     Sealed viscous filled
  • Max Battery Dimensions     5.45 x 1.83 x 1.38" (138.5 x 46.5 x 35mm)
  • Receiver     Included
  • Shock Type     Oil-filled aluminum body
  • Power Type     Electric
  • Gear Pitch     MOD1
  • Servos     Included
  • Approximate Assembly Time     No assembly required
  • Body     Trimmed and painted
  • Brakes     Integral with ESC
  • Pinion     12T
  • Final Drive Ratio     12.97:1
  • Scale     1/10
  • Motor Type     Brushless
  • Rear Track     13.25" (336mm)
  • Speed Control     Included
  • Wheelbase     14.75" (375mm)
  • Spur Gear     40T
  • Suspension     Independent
  • Track Surface     13.25" (336mm)
  • Battery     Sold Separately
  • Ground Clearance     1.75" (44mm)
  • Internal Gear Ratio     3.89:1
  • Product Length     24.3" (617 mm)


In The Box

  • (1) Lasernut U4 4WD Brushless RTR Vehicle
  • (1) Spektrum(TM) Firma 130A Brushless SMART ESC (installed)
  • (1) Spektrum(TM) SR6100AT Receiver with AVC
  • (1) Spektrum DX3(TM) 2.4GHz Radio Transitter
  • (1) Product Manual
  • (1) Spektrum Firma 4-Pole 1900Kv 550 Motor (installed)


Needed to Complete

  • (1) 3S-4S LiPo Battery with EC5(TM) or IC5(TM) connector
  • (1) Compatible Battery Charger
  • (4) AA batteries for Transmitter


Used with permission, copyright ©2022 Team Losi/Horizon Hobby, Inc. Copyright ©2022 Brey Corp. t/a Hobby Works.®

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