Losi LOS03028T2 Lasernut U4 2.2 4WD RC Rock Racer (Black)

Product Code: LOS03028T2
$849.99 $719.99 15%

In-stock items and stock levels are subject to continuous change. Click & collect orders can be used to reserve items prior to in store collection. Store transfers and holds available on request.

The Losi Lasernut U4 1/10-scale 4WD Rock Racer (RR) RTR with Spektrum Smart builds on the TEN platform delivering a great out-of-the-box experience to be able to throw down in any 2.2 Unlimited class.

Factory assembled

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 Smart builds on the TEN design and adds items rock racers demand such as aluminium 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 Smart 130A Brushless ESC and Spektrum 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 connector. Drivers stay in control with a DX3 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 colour variations. Working together with BF Goodrich Tires, the Lasernut U4 has a scaled-down M/T tires that have an aggressive tread pattern that handles any terrain. The Losi Lasernut Rock Racer is the ultimate U4 racer with scale looks, insane speeds, performance and Spektrum Smart Technology.

Legendary TEN Platform

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

Spektrum SMART ESC

The ESC is waterproof, completely programmable and comes pre-wired with a high-current IC5 connector. The ESC will work with most sensorless brushless motors and is 3S-4S Li-Po compatible.

Officially Licensed Lasernut Race-Inspired Scale Body and Roll Cage

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

Officially Licensed Wheels and Tyres

The included scale licensed Raceline 2.2 racing wheels and BF Goodrich M/T tyres 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

Coil-Over Oil Filled Shocks with Pre-Load Adjustment

Adjustable oil-filled coil-over shocks on all four corners soak up the gnarliest terrain. The aluminium threaded 12mm shocks are fully-adjustable and allow you to tune the handling of the Lasernut U4 to maximize performance and dominate anywhere.

Aluminium Chassis

The foundation of the Lasernut U4 consists of a 3mm, anodized aluminium chassis plate with a 4mm upper deck. Whether you are hitting the rocks, getting huge air, or just wide open, the 3mm chassis just keeps asking for more!

LED Light Bar and Pod Lights

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.

Adjustable Turnbuckles

For added adjustability and tune-ability, adjustable turnbuckles come standard on the Lasernut U4.

Adjustable Sway Bars

The included sway bars are fully adjustable and help you push the Lasernut U4 to its limits.

Adjustable Shock Towers

4mm 6061-T6 Aluminium shock towers are built tough to withstand the punishment the font end of the Lasernut U4 will receive

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 dialled 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, centre (aluminium) and rear differentials can also be tuned for various conditions.

Metric Hardware

Complete metric hardware is featured throughout the Lasernut U4, including bearings, screws and nuts.

50+ MPH Spektrum Firma 4-Pole 1900kv 550 Motor

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

Spektrum DX3 Radio System

The Spektrum DX3 radio system offers advanced features like AVC control, a 3-position throttle limiting switch and travel adjust.

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.


  • TEN 4WD Platform
  • Spektrum 130A Brushless SMART ESC and 4-Pole 1900kv 550 Motor
  • Spektrum DX3 2.4GHz radio system with AVC and optional telemetry
  • Waterproof Components
  • 12mm race inspired threaded aluminium bodied shock absorbers and shock caps
  • Officially-licensed Lasernut Race-Inspired Scale Body & Cage
  • Officially-licensed BF Goodrich M/T Tyres
  • Officially-licensed Raceline 2.2 Wheels
  • Adjustable sway bars
  • Three Oil Filled Gear Differentials
  • 3mm, anodized aluminium chassis
  • LED light bar and pods
  • Adjustable turnbuckles
  • Adjustable shock towers
  • Independent front and rear suspension
  • 4x4 Driveline with Adjustable Differentials
  • Metric hardware throughout
  • Top speeds of 80+km/h with 4S LiPo (sold separately)


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


  • 3S or 4S LiPo Battery
  • Compatible charger
  • LiPo safety bag

  • Type : Ultra 4 Buggy
  • Completion Level : Ready-to-Run
  • Scale : 1/10
  • Length : 24.3 in (617.2mm)
  • Width : 13.25 in (336.5mm)
  • Height : 8 in (203.2mm)
  • Weight : Varies on equipment used
  • Ground Clearance : 1.75 in (44.4mm)
  • Wheelbase : 14.75 in (374.6mm)
  • Track : 13.25 in (336.5mm)
  • Front Track : 13.25 in (336.5mm)
  • Rear Track : 13.25 in (336.5mm)
  • Chassis : 3mm, 6061 T-6 Aluminium
  • Suspension : Independent
  • Shock Type : Aluminium Oil Filled
  • Drivetrain : 4WD
  • Differential : Sealed viscous filled gear differential
  • Wheel Type : Raceline
  • Wheel Diameter : 2.2 in x 3.0 in
  • Wheel Width : 1.63 in (41.4mm)
  • Tyre Compound : N/A
  • Tyre Tread : BFG Mud Terrain
  • Tyre Diameter : 5.75 in (146mm)
  • Motor Type : Non-Sensored Brushless
  • Motor Size : 550 4 pole 1900kv
  • Pinion : 12T
  • Spur Gear : 40T
  • Gear Pitch : MOD1
  • Internal Gear Ratio : 3:89:1
  • Final Drive Ratio : 12.97:1
  • Speed Control Included : Yes
  • Radio : Spektrum DX3
  • Servos Included : Yes
  • Body : Lasernut
  • Ball Bearings : Yes
  • Experience Level : Intermediate
  • Recommended Environment : All-Terrain
  • Is Assembly Required : No