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Losi (LOS)
SKU:LOS03028T1
1/10 Lasernut U4 Ready to Run (Blue) (LOS03028T1)
1/10 Lasernut U4 Ready to Run (Blue) (LOS03028T1)
The Losi Lasernut U4 1/10-scale 4WD Rock Racer is designed for those who demand high performance and durability in their RC vehicles. Built on the renowned TEN platform, it combines strength with advanced technology to deliver an exhilarating driving experience, suitable for competition in the 2.2 Unlimited class.
This Ready-to-Run (RTR) model comes equipped with cutting-edge features, including a Spektrum Firma Smart 130A Brushless ESC and a Spektrum Firma 4-Pole 1900kv 550 motor, offering outstanding efficiency and power, with speeds exceeding 50 MPH. The waterproof electronic components ensure this vehicle can endure various weather conditions, providing the freedom to run no matter the environment.
The Lasernut U4 features adjustable aluminum shocks, sway bars, and a full metric hardware package, ensuring compatibility and ease of use globally. The vehicle is fully equipped with BFGoodrich KM3 tires on official Raceline 2.2 wheels, designed to tackle any terrain with confidence. Its scale U4RC body and roll cage are officially licensed and come in multiple color variations, enhancing its realistic appearance.
This rock racer includes advanced technology such as Spektrum AVC (Active Vehicle Control), providing extra stability and control while driving. The DX3 transmitter allows for smooth operation with features like throttle limiting and adjustable travel for the ultimate tuning experience.
Designed for performance, the Lasernut U4 boasts a robust 3mm anodized aluminum chassis, independently adjustable suspension, and multiple adjustable components like turnbuckles, sway bars, and shock towers, allowing drivers to customize their vehicle to match any driving condition. With a wheelbase of 14.75 inches and ground clearance of 1.75 inches, it is built for both agility and strength on rugged terrains.
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Parts List
Parts List
Product Manual
Product Manual

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Overview
The Losi Lasernut U4 1/10-scale 4WD Rock Racer is designed for those who demand high performance and durability in their RC vehicles. Built on the renowned TEN platform, it combines strength with advanced technology to deliver an exhilarating driving experience, suitable for competition in the 2.2 Unlimited class.
This Ready-to-Run (RTR) model comes equipped with cutting-edge features, including a Spektrum Firma Smart 130A Brushless ESC and a Spektrum Firma 4-Pole 1900kv 550 motor, offering outstanding efficiency and power, with speeds exceeding 50 MPH. The waterproof electronic components ensure this vehicle can endure various weather conditions, providing the freedom to run no matter the environment.
The Lasernut U4 features adjustable aluminum shocks, sway bars, and a full metric hardware package, ensuring compatibility and ease of use globally. The vehicle is fully equipped with BFGoodrich KM3 tires on official Raceline 2.2 wheels, designed to tackle any terrain with confidence. Its scale U4RC body and roll cage are officially licensed and come in multiple color variations, enhancing its realistic appearance.
This rock racer includes advanced technology such as Spektrum AVC (Active Vehicle Control), providing extra stability and control while driving. The DX3 transmitter allows for smooth operation with features like throttle limiting and adjustable travel for the ultimate tuning experience.
Designed for performance, the Lasernut U4 boasts a robust 3mm anodized aluminum chassis, independently adjustable suspension, and multiple adjustable components like turnbuckles, sway bars, and shock towers, allowing drivers to customize their vehicle to match any driving condition. With a wheelbase of 14.75 inches and ground clearance of 1.75 inches, it is built for both agility and strength on rugged terrains.
Features
- 1/10-scale 4WD Rock Racer, Ready-to-Run configuration
- Built on the renowned TEN 4WD platform for strength and durability
- Spektrum Firma 130A Brushless Smart ESC for advanced performance
- Spektrum Firma 4-Pole 1900kv 550 motor, capable of speeds over 50 MPH
- Waterproof components for all-weather operation
- 12mm aluminum body shock absorbers with adjustable settings
- Officially licensed Lasernut Racing scale body and roll cage in multiple color options
- Officially licensed BFGoodrich KM3 Mud-Terrain tires with aggressive tread pattern
- Officially licensed Raceline 2.2 wheels
- Adjustable sway bars for enhanced handling
- Three oil-filled gear differentials for smooth performance
- Spectrum DX3 2.4GHz radio system with AVC for enhanced stability
- Independent front and rear suspension for exceptional handling
- Adjustable turnbuckles and shock towers for personalized tuning
- 4x4 drivetrain with adjustable differentials for superior traction
- Robust 3mm anodized aluminum chassis for maximum durability
- Full set of metric hardware for easy maintenance
- LED light bar and pod lights for night operations
- Pre-wired with high-current IC5 connector for easy battery connection
- Completely assembled, no additional assembly required
Needed to Complete
- Batteries (sold separately)
- Charger (sold separately)
Specifications
- Scale: 1/10
- Vehicle Type: Rock Racer
- Chassis: 0.12" (3mm) thick 6061 T-6 aluminum
- Drivetrain: 4WD
- Motor Type: Brushless
- Top Speed: 50+
- Approximate Assembly Time: No assembly required
- Power Type: Electric
- Completion Level: Ready-To-Run
- Ground Clearance: 1.75" (44mm)
- Wheelbase: 14.75" (375mm)
- Product Length: 24.3" (617 mm)
- Product Width: 13.25" (337 mm)
- Product Height: 8" (203 mm)
- Product Weight: Varies with equipment
- Water-Resistant: Yes
- Battery: Sold Separately
- Charger: Sold Separately
- LiPo Compatibility: 3S, 4S
- Connector Type: IC5
- Front Track: 13.25" (336mm)
- Rear Track: 13.25" (336mm)
- Pinion: 12T
- Spur Gear: 40T
- Final Drive Ratio: 12.97:1
- Internal Gear Ratio: 3.89:1
- Shock Type: Oil-filled aluminum body
- Differential: Sealed viscous filled
- Brakes: Integral with ESC
- Servos: Included
- Radio: Included
- Receiver: Included
- Color Variant: Blue
- Technology: AVC and SMART
- Bushing Material: Metal
- Track Surface: 13.25" (336mm)
- Ball Bearings: Full set
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