Name: Technic 42099 4x4 X-treme Off-Roader
Brand: LEGO
SKU: 4OX2WJJZE8OI
Price: 533.6 CAD
Availability: InStock
Rating: 4.3 (41 reviews)

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Technic 42099 4x4 X-treme Off-Roader

<ul><li><div>This cool STEM 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</div></li><li><div>The app-controlled LEGO 4x4 X-treme building set is operated via a smart device with 3 alternative screens Go to LEGO.com/device check for a list of compatible STEM toys</div></li><li><div>Truck toy features 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</div></li><li><div>One-touch control: Drag a direction on the screen and see the 4x4 carry out the maneuver</div></li><li><div>Challenges &amp; achievements: Complete challenges with this STEM toy to unlock achievement badges</div></li></ul>

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[This review was collected as part of a promotion.] It was nicely stacked and packed for building it from scratch, what an engineering marvel to build this truck. It took me 4 days of continuous effort to enjoy me building this monster truck. In my true opinion I enjoyed more building (assembling) Legos piece by piece. it refreshed my mechanical memories. I absolutely enjoyed 4 days of building effort and playing after it was fully assembled. It was like watching a baby growing up.

Absolutely great brainer product

LEGO

As built, this is a challenging model with incredible structural strength. As built this is a 4x4 truck that can handle minor off-roading. As built, this is a fun truck! We had wet snow falling the day after I built it and I took it outside. In 1/4" (7mm) or less of heavy wet snow the truck did fine, but once you got in to deeper snow it would stall once the snow built up under the differential. Not very impressive. This is why this is a 4 star model. 

How to get to 5 star? Below are three changes you need to make, extremely easy if you built it this way outright, if you need to modify it look up on YouTube the 5-minute fix for the 42099 model. This little set of changes does two things, it cuts the speed in half, but it allows you to run in 1.5" (38mm) heavy wet snow and keep going. I drove around for over 20 minutes until I finally pushed my luck and high-centered. 

5 Star truck! You just need to do the following three things!

Halve you speed, double your power. Thanks to Youtuber: RacingBrick

Step 78 - use the tan gear from step 82 not the black one
Step 82 - use the black gear from step 78 not the tan one you already used
Step 159- left side of the picture, there is a black and tan gear, carefully swap them. 

Have Fun! Remember, LEGO allows you to explore! Never forget that!

A 4 star model with a 5 star option!

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!

Great Kit to get started with FPV

Samuel

[This review was collected as part of a promotion.] I got this for my 2 kids, 9 yr old and 4 yr old. My son really just loves to look at cars and trucks so this was a no brainer. My daughter is super into legos and we started to work on this together. My son had fun putting on the sticker decals. Unfortunately, I had to finish the job but it was super fun for the kid in me too. I do think the recommended age is accurate as an older kid would probably want to spend more time with building it. But, being able to then use the app and control and drive it around made it so much fun. The motors are actually strong enough to go over small things which makes this "off road" toy actually work. The app was super easy to use even for my 4 year old, so he still gets to play with it. YAY!

I immediately started looking for the other builds in this product line. This is a great toy!

Such an amazing Build and Toy

good model and fun to build. Patience and skill are required

one for anyone to build with patience and skill

asda.com

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.

Fantastic 4X4!

While building is important to many, what to do with the item after assembly is more important to me.  I don't want another dust collecting piece of plastic decoration.  Others want something to just put on a shelf and look at.  This item offers more than that.  The interface does need to be swapped so steering is on the right and throttle is on the left.  If you write a profile using the Lego PF application, you can decide where the controls go.  The Lego application control software only offers one interface, not two.  I like the fact that the entire top of the truck can be removed so you can take the hub out for a battery swap.  No screwdriver needed for the hub battery cover.  I have two of these trucks.  I drive them outside at the park.  The range is not bad, but my phone overheats.  They are good crawler trucks.  The wheel hubs have built in gear reduction, which is nice.  The ball joint drive shafts to the wheels are like the Audi E-Tron.  They are good.  These trucks can drive over quite a few outside obstacles.  Just make sure you have a fresh set of 6AA in the hub.  The next time I build this truck, I might change some of the gears.  I prefer the differential gears used in the Audi instead of the 3 gear differentials in this kit, if there is room.  If not, I would use the 5 gear box with the red double bevel gear instead with the black 24 tooth double bevel gear to turn it, which will give good torque.  I think the Daytona SP3 has a good differential that might work in this truck.  It's the 5 gear differential gearbox with the yellow gears (same as the Audi).  This truck uses the tire rims that will allow install of Wrangler Adventure R/C hobby grade 1.9 crawler tires with foam inserts.  I have not tried that yet, instead of the tractor tires this kit comes with.  That might be another experiment in the future.

Fun To Drive

Built this with my daughter who Is showing a intrest in lego that I've built so thought ok get this one and the rally car .
The build was ok and no real problems.
Only down thing which I found and so did my daughter with both models they just don't go fast enough for kids .. my daughter loved the app control using the touch screen control . But today's kids want speed ? So please lego change the gearing so future models go quicker, as my daughter who's 9 get fed up with it going so slow .. I will look and see if can change the gearing myself for her but most wont and just give up on it..

Great start with the app control ...

Fun to build. On the app, to me, the controls are reversed. Steering on left gas on right. Takes a bit to get use to. Fun to build. Not repetitive at all. I like displaying more than playing with it. Mine seems to pull to one side when driving.

A couple years ago I gave this to my son who had been asking me to buy it forever. We gave it to him and he quickly built it and had tons of fun driving it. However in less than two weeks the rear axels locked. Thinking it was a stick or something like that lodged into the gears he rebuilt it and it worked for another 15 minutes or so before it did the same thing. We then put it into storage and forgot about it until now. He rebuilt it AGAIN and used brand new batteries. This time the front motor spun pretty well but the rear motor would weakly spin for about 5-10 seconds and stop. We would also try driving it downhill which would work but it wouldn't ever drive on flat ground. I feel like he has tried everything and the xl motor for the rear wheels is broken inside. Unfortunately lego has retired this product and we cannot get it. Any ideas on how to fix this?

Good build but bad driving

Technic 42099 4x4 X-treme Off-Roader

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