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Technic™Technic™
LEGO®6251559

4X4 X-treme Off-Roader

4X4 X-treme Off-Roader4.1765517.
Average rating4.2out of 5 stars

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Price$379.99

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Hi-tech motorized model

Cool 4x4 Off-Roader, powered by an advanced smart hub with 3 motors and operated via the intuitive LEGO® TECHNIC™ CONTROL+ app.

Super-cool design and performance

Drive in all directions, traverse obstacles and get real-time feedback, such as speed and tilt—all via a smart device.
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LEGO® Technic™ 4x4 X-treme Off-Roader

Awesome design

Rugged truck with huge wheels and chunky tires.

An educational play experience

LEGO® builders learn advanced elements of engineering.

Tough suspension

Rugged high-rise independent suspension for rough terrain.

Challenges and achievements

Complete fun challenges to win reward badges.

Super-precise control

Operated via the free LEGO® TECHNIC™ CONTROL+ app.

Multifunction control

Perform amazing maneuvers with a touch of a fingertip.

A highly rewarding building experience

LEGO® builders are introduced to advanced elements of engineering as they construct this super-realistic LEGO Technic™ model.

Are you ready to take your LEGO® play experience to another level? The LEGO Technic™ 4x4 X-treme Off-Roader is powered by an advanced Smart Hub with 3 motors and controlled via the intuitive LEGO TECHNIC CONTROL+ app. The sophisticated app technology enables super-precise movement and functionality, while delivering endless authentic digital play combinations with authentic sound effects. Users can choose from different control screens to drive forward, reverse, steer, accelerate, brake and traverse obstacles. You can also get real-time feedback, such as a speed and tilt log or test out your skills in the app’s challenges and achievement section. This sturdy 4x4 app-controlled truck comes with high-rise independent suspension, large wheels with chunky tires and a fresh color scheme with intricate sticker detailing. Its complex gear mechanisms and technologies introduce LEGO builders to advanced elements of engineering, while improving reaction times, cognitive thinking and creative problem-solving skills.

  • This cool toy truck model is controlled via the LEGO® TECHNIC™ CONTROL+ app and powered by an advanced Smart Hub with 2 XL motors and 1 L motor for a more immersive play experience, authentic movements and hours of fun.
  • The app-controlled LEGO® 4x4 X-treme Off-Roader is operated via a smart device with 3 alternative screens. Go to LEGO.com/devicecheck for a list of compatible smart devices.
  • Multi-function control: Drive forward, reverse, steer, accelerate, brake, traverse obstacles, play sound effects and get real-time feedback, such as a speed and tilt log.
  • One-touch control: Drag a direction on the screen and see the 4x4 carry out the maneuver.
  • Challenges & achievements: Complete challenges to unlock achievement badges.
  • Sturdy app-controlled LEGO® truck with high-rise independent suspension, large wheels and chunky tires.
  • Smart Hub features Bluetooth Low Energy (BLE) connectivity, activation button, 6 axis sensor (3 gyro and 3 accelerometer sensors) and 4 connectivity ports.
  • Download the LEGO® TECHNIC™ CONTROL+ app from the App Store or Google Play. Ask your parents’ permission before going online.
  • This remote-controlled truck requires batteries (not included). Please refer to the product packaging for type and quantity.
  • This buildable LEGO® Technic™ model introduces LEGO builders to advanced elements of engineering, while improving reaction times, cognitive thinking and creative problem-solving skills.
  • Not compatible with LEGO® Power Functions systems.
  • 4x4 X-treme Off-Roader measures over 7” (19cm) high, 12” (33cm) long and 8” (22cm) wide.
Building Instructions
4X4 X-treme Off-Roader
  • Free standard 1 to 4 business day delivery on all merchandise orders over $149!
  • Express delivery available at checkout.
  • Custom parts orders are sent separately from merchandise and take additional time to process and deliver.
  • Unopened merchandise may be returned for a full refund within 90 days of receipt of your order.
Some exclusions apply. Visit our Deliveries and Returns page for more information.

Customer Reviews

Overall RatingAverage rating4.2out of 5 stars
(17 Reviews)
71% would recommend this product.

Rating

Overall Experience

Play ExperienceAverage rating3.7out of 5 stars
Level of DifficultyAverage rating2.5out of 5 stars
Value for MoneyAverage rating3.6out of 5 stars
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Reviews

  • in 7 days
    Average rating5out of 5 stars
    Great Kit to get started with FPV
    | 35-44
    I would recommend this to a friend!
    Purchased for: Self
    I was really motivated from that tower challenge video, that I went out and got this kit, as well as a FPV camera, and Receiver Monitor. I struggled mostly with trying to manage the cables in segment TWO taking almost FIFTEEN minutes to route them without them popping out, and wanted to give them enough slack as well (bit of a perfectionist trying to get it to look like how it was in the book). I was surprised this kit didn't offer a Model B variant chassis to build with other parts, though not really disappointed since this one turned out great without any of the stickers. Overall it was a great experience building it, and am having a ton of fun with my FPV RC Truck!
    Play ExperienceAverage rating5out of 5 stars
    Level of DifficultyAverage rating3out of 5 stars
    Value for MoneyAverage rating4out of 5 stars
    Build Time: 3 hrs 20 mins
    Building Experience: Advanced LEGO builder
    Was this helpful?
    554X4 X-treme Off-Roader
  • in 1 day
    Average rating2out of 5 stars
    Great model, overpriced, missing remote
    | 45-54
    Purchased for: Self
    As a long time Lego fan I wanted to get my hands on the first model with the new Control+ technology. First of all, the model is totally overpriced. $249 is a bad joke. In Europe it's available for about EUR 160 on Amazon, so I waited for a trip to Europe to get it there. The box is small enough to fit into a full size suitcase. EUR 160 or roughly USD 180 is a fair price for this set. Building the set is fun, the axles are very robust and it's fun to put all those parts together. Taking the finished model in operation is easy. Downloading the app tool some time, the app is big! After starting the app, I pressed the green button on the Lego hub and then communication was established seamlessly. First the app did a firmware update. Ok, get used to even firmware update your Legos :( Driving the first meters was smooth. The new motors are so much better than the old ones. I'm looking forward to build many models in the future with these new motors. After a few minutes however using the app got tedious. there is no feedback on the screen, it's difficult to know where you are steering. The app is no replacement for the real remote control. I compared 42099 with it's 10 year old cousin 9398, and 9398 is much more fun to play with! Lego, please get the remote ready! If the model had a remote, I would recommend it to my friends. With the app, it's not recommendable.
    Lego

    Response from LEGO SHOP

    7 October 2019
    Keith, Customer Service
    Hi there, thanks for your review! I'm sorry you're not a fan of the LEGO® Technic™ Control+ app. We designed the Control+ system to use an app rather than a physical remote because it allows for functionality that's not possible through traditional remote control. For example, you can enable sound effects, real-time speed and tilt information, challenges & achievements, and one-finger gesture control! If you need help using the app, please get in touch at LEGO.build/Service.
    Play ExperienceAverage rating1out of 5 stars
    Level of DifficultyAverage rating2out of 5 stars
    Value for MoneyAverage rating3out of 5 stars
    Build Time: 5 hrs
    Building Experience: Advanced LEGO builder
    Was this helpful?
    254X4 X-treme Off-Roader
  • in 30 days
    Average rating5out of 5 stars
    Lego technic 42099
    | 45-54
    I would recommend this to a friend!
    Purchased for: Self
    A great easy build, clear instructions and great new technology for this set. This one would be great for MOC's and modifying other sets.
    Play ExperienceAverage rating5out of 5 stars
    Level of DifficultyAverage rating3out of 5 stars
    Value for MoneyAverage rating4out of 5 stars
    Build Time: 3 hrs 20 mins
    Building Experience: Advanced LEGO builder
    Was this helpful?
    554X4 X-treme Off-Roader
  • in 13 days
    Average rating5out of 5 stars
    Fantastic 4X4!
    | 25-34
    I would recommend this to a friend!
    Purchased for: Self
    As a huge Technic fan, I am very pleased with this model. I had to get my hands on the new Control+ system as soon as possible and am pleasantly surprised. New planetary hubs and stronger, longer CV joint components are going to be game-changers. Modular design means the body is easily removable. Don't be concerned with the price to parts ratio. The Control+ is very robust and adds quite a bit to the play. There are achievements and badges to earn inside the app, which makes it pretty hard to put down. As much as I love the older 9398 4X4 Crawler, I was concerned this model might have some of its shortcomings. I was surprised by the increased speed of this model over the 9398 while maintaining enough torque to handle most of the obstacles I threw at it. If you are a Technic fan, I don't think you'll be disappointed.
    Play ExperienceAverage rating5out of 5 stars
    Level of DifficultyAverage rating2out of 5 stars
    Value for MoneyAverage rating5out of 5 stars
    Build Time: 3 hrs 30 mins
    Building Experience: Expert LEGO builder
    Was this helpful?
    554X4 X-treme Off-Roader
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