Losi Lasernut U4 2.2 Rock Racer 4wd RTR with SMART ESC, Black, LOS03028T2

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With full independent suspension packed into the renowned TEN platform the Losi Lasernut U4 1/10th scale 4WD Rock Racer RTR is formidable. Packed with advanced Spektrum Smart technology this RC Rock Racer is poised to become a favourite for those who race rough.

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  • Acclaimed 4WD TEN platform
  • Spektrum 1900kv 4-Pole 550 motor and brushless 130A SMART ESC
  • 2.4GHz Spektrum DX3 transmitter with optional telemetry and AVC
  • Protected waterproof components
  • Shock caps and absorbers made from race inspired 12mm threaded aluminium
  • Sway bars are fully adjustable
  • Anodised 3mm aluminium chassis plate with upper deck of 4mm
  • 4mm 6061-T6 adjustable aluminium shock towers
  • Officially licensed components include – BF Goodrich M/T Tyres, Raceline 2.2 Wheels, and, Lasernut Race inspired body and cage
  • Three gear differentials that are oil filled
  • Independent suspension on front and rear
  • LED pod lights and light bar for night driving
  • Adjustable turnbuckles for increased adaptability and tuning
  • Increased handling and traction provided by adjustable differentials on the 4x4 driveline
  • Screws, nuts and bearings all part of a complete metric hardware set used throughout
  • Attach 4S LiPo (not included) to reach speeds of 80 km/h+
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Losi Lasernut U4 2.2 Rock Racer 4wd RTR with SMART ESC, Black, LOS03028T2

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Product Information

Unlimited potential with the Losi Lasernut U4 2.2

Recognised worldwide as a proven performer with a reputation for tough endurance, the TEN 4WD platform is perfect to showcase the abilities of the new Losi Lasernut U4 1/10th scale 4WD Rock Racer. Featuring an anodized 3mm rigid aluminium chassis plate topped with a 4mm equally tough upper deck, and, a fully adjustable Lasernut U4 to set the independent suspension and drivetrain to suit your skillset and the prevailing conditions. What you end up with is superb and consistent handling from your front and rear suspension that ensures your Lasernut Rock Racer is performing at maximum levels. The coil-over shocks on the suspension system are 12mm aluminium threaded that are also fully adjustable to suit conditions. Adjustable aluminium turnbuckles and sway bars are also of the highest rock racing standard. In order to keep things simple for you the hardware package on the Losi Lasernut U4 1/10th scale 4WD Rock Racer RTR is fully metric.

Lasernut Ultra4 RC replica

Being the only completely unlimited U4 with fully independent suspension on the market is not the only technological advantage the Losi Lasernut U4 1/10th scale 4WD Rock Racer RTR enjoys over its rivals. This RC Rock Racer comes packed with Spektrum Smart technology with a Brushless 130A Smart ESC and a 1900kv 4-Pole 550 motor which will give you more data, improved efficiency, and, extra power. The Smart 130A ESC is wired with IC5 high-current connectors, is completely programmable, works with a majority of sensorless brushless motors, and, 3S to 4S LiPo compatible. Put a 4S LiPo in it to hit speeds up to 80+ km/h. The ESC, receiver and servo on the Lasernut Rock Racer are also waterproof with everything being sealed for when you take it through the wet stuff.

Losi Lasernut U4 2.2 Rock Racer

The Losi Lasernut U4 1/10th scale 4WD Rock Racer RTR comes with a Spektrum DX3 transmitter and compatible Spektrum receiver that includes Active Vehicle Control, travel adjust, and, 3-position throttle limiting switch. There are a number of officially licensed features on the Losi Lasernut RC Rock Racer which include the U4RC body/roll cage that has been race-inspired and is available in two different colours and graphic variations with both featuring an easily accessed battery compartment due to a flip-up cage. There are licensed BF Goodrich M/T tyres and Raceline 2.2 wheels that give this RC rock racer a brilliant scale look to match the exhilarating performance. Sun gone down? No problems. The Losi Lasernut RTR features an integrated LED light bar along with amber pod lights so you can hit the track at night as well. If you wanted a quadruple threat the Losi Lasernut U4 1/10th scale 4WD Rock Racer RTR brings it with speed, looks, SMART’s and performance!

What's in the box?

  • (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

What you need

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


Ultra 4 Buggy
Completion Level
24.3 in (617.2mm)
13.25 in (336.5mm)
8 in (203.2mm)
Varies on equipment used
Ground Clearance
1.75 in (44.4mm)
14.75 in (374.6mm)
13.25 in (336.5mm)
Front Track
13.25 in (336.5mm)
Rear Track
13.25 in (336.5mm)
3mm, 6061 T-6 Aluminium
Shock Type
Aluminium Oil Filled
Sealed viscous filled gear differential
Wheel Type
Wheel Diameter
2.2 in x 3.0 in
Wheel Width
1.63 in (41.4mm)
Tyre Compound
Tyre Tread
BFG Mud Terrain
Tyre Diameter
5.75 in (146mm)
Motor Type
Non-Sensored Brushless
Motor Size
550 4 pole 1900kv
Spur Gear
Gear Pitch
Internal Gear Ratio
Final Drive Ratio
Speed Control Included
Spektrum DX3™
Servos Included
Ball Bearings
Experience Level
Recommended Environment
Is Assembly Required

Product Manuals

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