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  • Writer's pictureKrazyHobbies

LOSI Lasernut U4 4WD Buggy -Brushless RTR

Updated: Jan 10


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 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 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.

Download LOSI Lazernut U4 Exploded Views
LOSI Lazernut U4 Exploded Views
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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 color 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.


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 Lasernut Race Inspired Scale Body

A Lasernut Licensed race inspired scale U4RC body with exciting graphics offered in two different color variations.

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.

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.

At a Glance

What's in the Box?

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

Product Specifications



Length:24.3" (617 mm)

Width:13.25" (337 mm)

Height:8" (203 mm)

Ground Clearance:1.75" (44mm)

Wheelbase:14.75" (375mm)

Weight:Varies with equipment

Chassis:0.12" (3mm) thick 6061 T-6 aluminum



Motor or Engine:Brushless Motor

Speed Control:Included


Batteries:Sold Separately

Charger:Sold Separately

Gear Pitch:MOD1


Shock Type:Oil-filled aluminum body

Body:Trimmed and painted

Ball Bearings:Full set

Is Assembly Required:No

Needed to Complete

• 3S or 4S Hardcase LiPo Battery with IC5/EC5 Connector • 3S/4S Compatible LiPo Charger • Protective LiPo Storage/Charging Case

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