The Arrma Grom lineup is proof that mini RC doesn't mean compromised RC. These small-scale bashers pack hobby-grade 4WD drivetrains, oil-filled shocks, metal gear differentials, and Spektrum Smart electronics into packages you can run in a parking lot, a backyard, or a hallway — and they start at $149. All Grom models compared side by side below: specs, real differences, and exactly which one to buy. (And if you landed here searching for an Arrma Senton Grom or Big Rock Grom — those models don't exist. We'll cover the real lineup, which is honestly just as good.)
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All Arrma Grom Models at a Glance
| Model | Scale | Type | Price | Top Speed | Best For | Rating |
|---|---|---|---|---|---|---|
| Arrma Granite Grom | 1/18 | Monster Truck | ~$149 | 20+ mph | All-terrain bashing, beginners | 9/10 |
| Arrma Mojave Grom | 1/16 | Desert Truck | ~$149 | 20+ mph | Mixed terrain, scale looks | 9/10 |
| Arrma Typhon Grom | 1/14 | Buggy | ~$149 | 20+ mph | Track, pavement, cornering | 8.5/10 |
| Arrma Mojave Grom 223S BLX | 1/16 | Brushless Desert Truck | ~$199–$229 | 35 mph (2S) / 50+ mph (3S) | Speed, brushless performance | 9.5/10 |
Check Price on Amazon — Granite Grom · Mojave Grom · Typhon Grom · Mojave Grom 223S BLX
What All Brushed Groms Share — The Platform
Before you pick a model, here's the single most important thing to know: the Granite, Mojave, and Typhon Grom all run on the same core platform. Same MEGA 380 28T brushed motor. Same Spektrum SLT 2-in-1 25A waterproof ESC/receiver combo. Same Spektrum SLT2 2-channel radio. Same Spektrum Smart 7.4V 1400mAh 2S 30C LiPo with IC2 connector (important — this is IC2, not Deans or JST). Same oil-filled coil-over shocks. Same metal gear differentials.
What changes between the three brushed models is the body shell, body proportions, and chassis geometry — which affects handling character and terrain preference without changing the underlying mechanicals. The scale designation differs too: the Granite is officially 1/18, the Mojave 1/16, and the Typhon 1/14. In practice, all three are compact enough to run in similar spaces — the Typhon is just a bit longer thanks to its buggy proportions.
My buddy and I each bought different Groms and we swap parts between them constantly. The motors, ESCs, batteries, driveshafts, and servos all cross over — that's the beauty of buying into a unified platform. If you upgrade the battery on one, it works in all of them. Any knowledge you build about one Grom transfers directly to the others.
For context on what these scales mean in the real world, our scale sizes explained guide breaks it down clearly.
Arrma Granite Grom — The Mini Monster Truck
The Arrma Granite Grom (~$149) is the most popular model in the lineup and the one most people start with — for good reason. Monster truck proportions mean tall, chunky tires, a high ride height, and serious ground clearance that lets it eat rough terrain without complaint. Grass, gravel, broken pavement, dirt paths — the Granite handles it all with a confidence that surprises anyone who hasn't driven a modern mini basher.
I bought the Granite Grom as a "beater truck" to keep in my car for those days when I have 20 minutes to kill at the park. Six months later, it's the RC I drive the most. Something about the size just makes it effortless to grab and go — no loading ramp, no worrying about tight spaces, no hesitation before sending it off a curb. It just goes.
Handling is stable and forgiving. The tall stance produces a bit of body roll in hard corners, which is completely appropriate for a monster truck and makes it feel planted and predictable rather than twitchy. It's the easiest Grom to recommend to anyone new to the hobby. Check our beginner's guide if you're still deciding whether this is the right entry point.
Pros: Best ground clearance in the lineup, most versatile terrain, beginner-friendly, the "grab and go" benchmark.
Cons: Higher center of gravity means it's not the tightest handler on smooth surfaces.
Check Price and Colors on Amazon
Arrma Mojave Grom — The Mini Desert Truck
The Arrma Mojave Grom (~$149) is, in many ways, the most visually impressive model in the brushed lineup. The desert truck body — scaled down from the full-size ARRMA Mojave — gives it a wide, aggressive stance with that unmistakable Baja-truck silhouette. It looks purposeful on a shelf, and it backs that up on trail.
The Mojave Grom runs slightly larger than the Granite at 1/16 scale, with a longer wheelbase and flatter profile. This translates into slightly better straight-line stability and a planted feel on packed dirt that the Granite can't quite match. It's not dramatically different — both trucks run the same motor and electronics — but the lower, wider stance of the Mojave body gives it a different character that many people prefer for mixed-terrain bashing.
Where the Mojave truly shines is scale realism. The desert truck body comes factory-finished in sharp color schemes, and when you're sending it across a dirt lot or through a patch of rough grass, it genuinely looks like a tiny Baja racer doing exactly what Baja racers do. If aesthetics are part of why you buy RC cars — and there's nothing wrong with that — the Mojave Grom delivers more visual drama than the Granite.
Pros: Best scale looks of the brushed lineup, slightly lower CG than Granite, excellent all-terrain capability.
Cons: Marginally less ground clearance than the Granite on really rough surfaces; costs the same but feels more "premium" — which creates expectations the brushed drivetrain can only partially meet.
Check Price and Colors on Amazon
Arrma Typhon Grom — The Mini Buggy
The Arrma Typhon Grom (~$149) is the lowest, most aerodynamically purposeful model in the lineup. Officially 1/14 scale, the buggy proportions give it a longer wheelbase, a rear wing, and a ground-hugging stance that reads as genuinely race-oriented — because it is.
That lower center of gravity translates directly into superior cornering. I ran my Typhon Grom on a local 1/18 scale track and it was genuinely competitive out of the box. The buggy stance gives it more grip than the Granite or Mojave on a prepared surface — you can carry real speed into corners without the body roll that limits the taller models. On smooth pavement or packed parking lot, this is the Grom to grab if handling precision is your priority. The arrma grom speed advantage of the Typhon comes from being able to use more of that speed in corners, not from raw motor output — the drivetrain is identical.
The trade-off is terrain capability. Lower ground clearance means the Typhon is less happy in deep grass or chunky terrain. On smooth surfaces, it's unbeatable in the lineup. On rough ground, the Granite or Mojave are more capable. Choose accordingly. Our full-size bashers guide covers how this translates at 1/10 scale and beyond if you ever want to step up.
Pros: Best cornering in the brushed lineup, lowest CG, longest wheelbase for straight-line stability, track-ready out of the box.
Cons: Lower ground clearance hurts in rough terrain; buggy body is more exposed than monster truck shells in hard crashes.
Check Price and Colors on Amazon
Arrma Mojave Grom 223S BLX — The Brushless Step-Up
The Arrma Mojave Grom 223S BLX (~$199–$229) is a different animal. Where the three brushed Groms are entry-level and roughly equivalent in performance, the 223S BLX is ARRMA's premium small-scale option — and it earns the premium in every measurable way.
The headline feature is the brushless 4500kV Spektrum motor paired with a higher-spec ESC that handles 2S and 3S LiPo batteries. On 2S, it hits 35+ mph — nearly double the brushed models. On 3S, it clears 50 mph, which is a genuinely wild number for something this small. To handle those speeds, it comes pre-equipped with upgrade parts that are optional add-ons on the brushed versions: oil-filled differentials, metal axle and wheel hub set, aluminum shocks, and adjustable steering links. ARRMA put the durability upgrades in the box because at 50 mph they're not optional.
The 223S BLX also adds Dynamic Stability Control (DSC) through the Spektrum electronics — a four-mode traction/steering correction system that makes 3S power accessible to drivers who are still building their skills. You can start with DSC on and turn it off as you gain confidence. It's a thoughtful addition for a truck that can genuinely hurt itself (and bystanders) at full power.
The Mojave Grom 223S BLX also comes with its own aluminum shocks, so the shock cap upgrade becomes irrelevant — it's already sorted from the factory.
Pros: 50+ mph on 3S, premium hardware included in the box, DSC stability control, 2S and 3S capable.
Cons: Higher price, uses IC2 connector which limits battery options, brushless speeds stress the chassis noticeably harder.
Check Price and Availability (Brushless)
Which Grom Should You Buy?
Here's the short version, because this decision shouldn't be hard:
Buy the Granite Grom if this is your first Grom or you want one truck that handles the widest variety of surfaces. Most versatile, most forgiving, safest choice for any terrain. For the majority of people reading this, it's the answer.
Buy the Mojave Grom if you want the best-looking brushed Grom and plan to bash on mixed dirt/grass terrain. Effectively the same performance envelope as the Granite but with more scale presence and a slightly flatter handling character.
Buy the Typhon Grom if you plan to run on tracks, smooth pavement, or parking lots. The buggy platform genuinely corners better in those conditions and you'll feel the advantage. If the brushed vs brushless question matters to you, this is also a popular platform for the Furitek Scorpion brushless upgrade.
Buy the Mojave Grom 223S BLX if you want the best of what small-scale RC can offer right now. Brushless power, premium hardware, 50+ mph capability, and a growth path from beginner to advanced through the DSC system. It costs more but justifies every dollar.
Tight budget? The three brushed models are interchangeable underneath, so whichever goes on sale first is the right one. Many people end up with multiple Groms anyway — at this price point, owning two or three different body styles for the same platform is a reasonable thing to do.
Best Arrma Grom Upgrades
The stock brushed Grom is complete and fun out of the box. But if you want to go further, here's where to put your money in order of impact.
Battery Upgrade
The included Spektrum Smart 7.4V 1400mAh 2S 30C IC2 (~$25–$30) is the correct replacement and spare. The IC2 connector is Spektrum proprietary — make sure any third-party battery you buy uses IC2 or pick up an adapter. The Smart G2 version (SPMX142S30H2) adds automatic storage discharge after 72 hours, which is a genuine quality-of-life improvement. A second battery is the single highest-impact purchase after buying the truck. Pair it with a quality charger — our charger guide covers the best options at every price point.
Brushless Conversion
The most popular upgrade in the Grom community. The Furitek Scorpion (FUR-2581) is the go-to drop-in brushless system: a 5600kV sensored motor paired with a 40A/70A peak ESC with built-in Bluetooth tuning via the FURICAR app (~$99.99). It pushes the brushed Groms well past 30 mph and transforms the throttle response.
Two important caveats. First, it's only compatible with the brushed Grom chassis (Granite, Mojave, Typhon brushed versions) — not the 223S BLX. Second, you'll need a new receiver since the stock Spektrum SLT2 system won't pair with the Furitek ESC. Most builders use a Spektrum SLR315 receiver. Read our brushed vs brushless explained guide before committing — the conversion is worthwhile but go in with realistic expectations about drivetrain stress at higher speeds.
Aluminum Shocks
The first structural upgrade worth making on the brushed Groms. The official ARRMA Aluminum Shock Set (ARA330824, ~$30–$35) replaces the stock plastic shocks with pre-assembled aluminum units pre-filled with 300cSt silicone oil. They handle hard landings significantly better and improve suspension feel across the board. Note: the 223S BLX already includes aluminum shocks from the factory, so this upgrade only applies to the brushed models.
For a cheaper partial fix, aluminum shock cap protectors (4-piece set, ~$9–$13) snap over the existing plastic caps to prevent the most common crack point without replacing the entire shock assembly.
Bearings
Unlike the 223S BLX — which comes with full ball bearings from the factory — the brushed Groms ship with bushings to keep the price down. Swapping in the FastEddy sealed bearing kit (16-piece set, ~$19.99) is the cheapest and most effective drivetrain upgrade you can make. Rubber-sealed 7×11×3mm and 8×12×3.5mm bearings reduce friction, improve efficiency, and noticeably extend drivetrain life. Installation takes about 30 minutes.
Tires
Stock tires are competent for general bashing. For specific surfaces — loose sand, indoor carpet, or groomed track — aftermarket 1/18 rubber helps. Pro-Line makes options that fit the Grom wheel hex. Budget $15–$25 for a set. This is optional — most people will be happy with stock tires for everyday use.
Arrma Grom vs Traxxas Mini Slash 4X4
Many buyers considering the Grom lineup are also looking at the Traxxas Mini Slash 4X4 (~$289.95, sold through authorized Traxxas dealers — not currently available on Amazon). Before comparing, it's worth noting the Mini Slash is a meaningfully different product: larger (~1/16 scale, 408mm long vs the Granite's ~250mm), heavier (3.62 lbs vs ~2 lbs for the Granite), comes brushless out of the box with a 550-size motor, and costs nearly double.
The Grom wins on value, variety, and grab-and-go convenience. Three different body styles on the same interchangeable platform for $149 each — and the 223S BLX option if you want brushless performance without leaving the ecosystem. The Traxxas Mini Slash wins on raw drivetrain durability (the 550-size brushless motor is overbuilt for the scale) and for anyone already invested in the Traxxas parts ecosystem. Both are excellent choices, but they're aimed at slightly different buyers. The Grom is the mini basher. The Mini Slash is closer to a small-scale performance truck.
FAQ
Q: How fast is the Arrma Grom?
The brushed Grom models (Granite, Mojave, Typhon) run 20+ mph stock. With a Furitek Scorpion brushless conversion, expect 30–35 mph depending on gearing and surface. The Mojave Grom 223S BLX hits 35+ mph on 2S and 50+ mph on 3S out of the box — arrma grom speed scales dramatically with the brushless system.
Q: What battery does the Arrma Grom use?
All brushed Groms use a Spektrum Smart 7.4V 1400mAh 2S 30C LiPo with an IC2 connector — this is Spektrum's proprietary connector with a data pin for Smart charging. It is not the same as Deans/T-plug or EC2, though it looks similar. The model number is SPMX142S30H2. The same battery also works in the Mojave Grom 223S BLX.
Q: Can you make the Arrma Grom brushless?
Yes, and it's the most popular Grom mod. The Furitek Scorpion (FUR-2581) is a proven drop-in brushless system at ~$99.99. It pushes the brushed chassis to 30+ mph with dramatically better throttle response. Note that it's only compatible with the brushed Grom variants and requires a compatible receiver — the stock Spektrum SLT2 system won't pair with the Furitek ESC. If you want brushless from the factory with no hassle, the Mojave Grom 223S BLX is the cleaner choice.
Q: Are Arrma Grom parts interchangeable between models?
The three brushed Groms — Granite, Mojave, and Typhon — share the same core drivetrain, motor, ESC, battery, and suspension components. Parts cross over freely between them. The Mojave Grom 223S BLX uses an updated brushless electronics package, so motor and ESC don't swap directly, but battery, shocks, and chassis hardware remain compatible.
Q: Is the Arrma Grom waterproof?
The Spektrum SLT 2-in-1 ESC and SX110 servo are rated waterproof. Light rain, damp grass, and small puddles are no problem. Submerging the truck or driving through standing water is not recommended — the motor and battery remain vulnerable. Dry it thoroughly after wet-weather runs.
Q: Do the Arrma Senton Grom and Big Rock Grom exist?
No. As of 2025, ARRMA has never released a Senton Grom or Big Rock Grom. The current Grom lineup consists of the Granite Grom (1/18 monster truck), Mojave Grom (1/16 desert truck), Typhon Grom (1/14 buggy), Mojave Grom 223S BLX (1/16 brushless), and the newer Quake Grom and Gorgon Grom (1/16, updated platform with adjustable suspension).
Conclusion
The Arrma Grom lineup is the best value in small-scale hobby RC right now. The three brushed models — Granite, Mojave, and Typhon — give you a real choice of body style and handling character at the same $149 price point. The Mojave Grom 223S BLX steps the whole concept up to brushless performance at 50+ mph for around $200.
For most people, the Arrma Granite Grom is the one to start with — most versatile, most forgiving, most grab-and-go. Check Price on Amazon.
Want something bigger? Check our full-size bashers guide for 1/10 scale options and up. New to the hobby? Our beginner's guide covers everything you need to know before buying your first RC car.
