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🚀 Small Scale, Big Bash — Own the Terrain Anywhere!
The ARRMA 1/18 Granite GROM MEGA 380 is a ready-to-run 4WD monster truck featuring a powerful Spektrum 2S LiPo battery, durable metal gears, and advanced suspension with oil-filled shocks. Its compact size and rugged design make it perfect for both indoor and outdoor bashing, delivering high-speed thrills up to 30 km/h with reliable, easy-to-use controls and quick body attachment for on-the-go customization.
| ASIN | B0CTJTL1VS |
| Additional Features | Brushless motor, closed drivetrain for all terrain, waterproof Spektrum™ SX110 metal gear steering servo, IC2® connection |
| Age Range Description | 14+ |
| Battery Description | Lithium-Ion Polymer |
| Best Sellers Rank | #59,824 in Toys & Games ( See Top 100 in Toys & Games ) #107 in Hobby RC Trucks |
| Brand Name | ARRMA |
| Color | Green |
| Customer Package Type | FFP |
| Customer Reviews | 4.3 out of 5 stars 304 Reviews |
| Educational Objective | Learning through play and exploration |
| Included Components | (1) ARRMA MEGA 380 28T brush motor, (1) ARRMA® GRANITE™ GROM Small Scale 4X4 Monster Truck RTR, (1) Spectrum 2.4GHz SLT2™ remote control, (1) waterproof spectrum SX110 metal gear steering servo, (1) Spektrum Smart 7.4V 1400mAh 2S 30C hard case LiPo battery with IC2®, (1) Spectrum S10 Smart G2 Mini 2S USB-C charger, (1) Waterproof Spectrum™ SLT™ 2-in-1 25A Regulator/Receiver Unit, Battery, Product … |
| Indoor Outdoor Usage | Outdoor |
| Item Dimensions | 12 x 9 x 7.9 inches |
| Item Highlight | RC Truck, Includes Battery & Charger, ARA2102T3 |
| Item Type Name | remote controlled car |
| Item Weight | 1.8 pounds |
| Manufacturer | ARRMA |
| Manufacturer Part Number | ARA2102T3 |
| Manufacturer recommended age | 14 years and up |
| Material Type | Plastic Metal Rubber |
| Maximum Speed | 30 kilometers per hour |
| Model Name | ARRMA RC Truck 1/18 GRANITE GROM MEGA 380 Brushed 4X4 Monster Truck RTR |
| Model Number | ARA2102T3 |
| Model Year | 2023 |
| Number of Batteries | 1 Lithium Polymer batteries required. (included) |
| Number of Items | 1 |
| Number of Packs | 1 |
| Number of Players | 1 |
| Operation Mode | Electric |
| Power Source | Battery Powered |
| Scale | 1:18 Scale |
| Set Name | Yes |
| Size | 12 inches x 9 inches x 7.9 inches |
| Subject Character | Granite Grom |
| Theme | Truck |
| Toy Vehicle Form | Car |
| Unit Count | 1 Count |
J**E
My nephew loves it
I do like that it is a grom and has tons of part support. The only thing that I don't like is attaching the body. There is a newer body that is basically the same underneath.
N**S
Fun inside and out
I have a few RC trucks, but they're all too large and fast to use inside. This truck fills that gap. This thing is SUPER fun inside, but is fast and tough enough to use outdoors. The unit feels very well built, and looks great, and being ARRMA you know youll have the aftermarket support for hop ups and replacement parts if needed. Battery life is great, easily getting 30 minutes of inside play before I slap the charger into it, and i don't think I've run the battery dry yet. Ill likely get at least one more of these because they're so fun. I really like the ability to limit steering at throttle, definitely well thought out features for a starter truck, that can grow in abilities with the user.
T**H
A+ Basher
Awesome basher, the only thing I would recommend right out of the gate is upgrading the wheels, but if you're careful on throttle you won't tear these ones up. Super fun very quick truck.
H**A
Fun RC Car!
I got this on sale for $108. This has been one of my better buys. I like this rc car. I got the V2. Downside being the plastic on one of the front outside axels failed and the axel popped out and disappeared somwhere. Waiting on the replacement metal parts now from Arrma ARA-311198($40 bucks). Upgrades add up quick!
D**1
Disappointing Battery and Charging Problems
I purchased this in December 2025 after doing quite a bit of research to find the right fit for my son while still prioritizing quality and long-term value. Unfortunately, it has been a very disappointing experience. We have barely been able to enjoy it because there appears to be an ongoing issue with the battery, charger, or both. I have already replaced the battery and the charger, and I have tried several different compatible charging bricks, but nothing has resolved the problem. The batteries either will not charge at all or will not hold a charge once they do. At this point, it has been incredibly frustrating—especially given the time and money already invested in troubleshooting and replacement parts. I expected a more reliable product, particularly for the price and the brand’s reputation. Until the charging issue is resolved, I cannot recommend it.
S**E
Just as fun as the big boys
*1st Thing, this must be a version 2, because there are tons of videos talking about it coming stock with plastic dogbones, differentials and all that. Not anymore, everything including the planetary gears in the diffs are metal (planetary gears look to be aluminum though). And also your Arrma logo on the front won't be white, I did that. Anyway, if you know about Arrma, it's Arrma tough, enough said. If you're new to the hobby, get it, you'll love it. It's tough as a tank, quick for it's size, runs smooth and quiet. If you charge the battery with the accompanied charger, get a higher wattage USB-C cord and use a high wattage charge block and you can charge the battery pretty quickly (less than an hour), otherwise plugging it in your laptop or something like that will take forever.
J**Y
Broken Servo saver arm
I have owned 4 of these trucks, and they are really amazing, and fun to play with. I've had no issues but when I unboxed it I seen damage and figured to record in case there was something wrong. When I took the truck out I noticed the steering was way to loose and had no restriction. I took off the center brace to figure why it was thinking the servo saver might be loose or just not on right. The servo saver arm was snapped and broken out of the box. It might be a delivery issue or a boxing rush. But I know arrma and they take care of there customers and vehicles. I ordered a aluminum replacement for it, kinda disappointed about it, but its alright.
A**N
Arrma Hit a Home Run with this one!!
Amazing entry level platform with unlimited upgradability. Excellent design with exceptional machining with premium materials. perfect for kids and beginners: virtually indestructable, but you can break it if you really really try, but it really takes some effort, I have really beat mine exceptionally hard and replacement parts are plentiful and cheap. i got mine gpm metal gears and diff cups in the front and a HR lcker in the rear and it is pretty bullet proof, im starting to break axels on 3s, but im crashing over 65 mph
M**N
Kleiner Supertruck für Papa und Sohn!
Sehr gutes RC Fahrzeug für ab 6 Jahren! Der Truck macht den Kindern aber auch den Erwachsenen spaß. Man kann an der Fernbedinung die Gesvhwindigkeit 50/75/100% Leistung einstellen. So ist es ideal zum üben. Der Akku lädt schnell. Hier muss man wissen, das das Ladegerät nur mit der richtigen Voltzahl betrieben werden kann. An einem 65watt Netzteil hat es zB nicht geladen und ich war kurz davor es zurückzuschicken. Der Truck geht bei 3,1 Volt Spannung nicht aus, sondern fährt nicht mehr aber lenkt noch. Dies ist zum Akkuschutz von Spektrum so vorgesehen. Auf 50% Leistung hat man 20 Minuten reinen Fahrspaß und Sprünge mit Chrashs selbst auf Asphalt wurde bisher alle unbeschadet überstanden. Nichts für Eltern die sich mit dem Fahrzeug nicht befassen. Ein 6 Jähriger kann die Anleitung noch nicht verstehen. Ich baue jetzt eine RC Rennstrecke im Garten und wir fahren um die Wette. Entspannendes Hobby für Groß und Klein.
D**O
Battery does not work from the first charge.
Battery does not work from the first charge.
O**W
Je recommande
Cet voiture est incroyable , très bonne prise en main !
T**6
Indestructible
Perfecto para iniciar en el rc de saltos , por mucho que le des no se rompe , calidad arrma , si se rompe es por mucha mala suerte , potencia limitada pero se mueve muy bien , amortiguadores espectaculares de gran recorrido , conclusion … calidad precio de lo mejor que se pueda pagar con dinero .
T**M
Fun little grom
I love Arrma R.C gotta say one of the best makers in a long time, strong and easy to work on and this little grom granite is a blast, its a little slow with the brushed motor but rc 4 wheel drive makes a crazy brushless conversion that makes this granite almost to fast, big fan of these groms
Trustpilot
2 weeks ago
2 weeks ago