ARRMA Infraction Grom 3S: Specs, Price And Release Date

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The ARRMA INFRACTION GROM 3S BLX 4X4 RTR is a 1/12 scale car that Horizon Hobby calls “the first-ever ARRMA all-road street basher on the GROM platform.” Horizon sums it up as “big INFRACTION energy, scaled down”: a 382 mm long car with a 3S brushless system, speed limiting and Spektrum stability control. This page collects the specs, prices, versions and release date Horizon has published, so you can see what you get before you order.

Quick answer: The INFRACTION GROM 3S RTR (ARA2315) is $249.99 without a battery or charger. The battery bundle (ARA2315S) is $289.99 and adds a Spektrum 1300mAh 3S Smart LiPo and an S22 Mini USB-C charger. Horizon rates it at 30+ MPH in Adrenaline Mode and 50+ MPH in Chaos Mode with the included PowerKey. It was released on October 28, 2026, per Horizon’s EU store listing. When checked on Oct 30, 2026, Horizon’s US and EU pages listed the RTR as In Stock, and the US battery bundle was orderable.

ARRMA Infraction Grom 3S Specs

Spec (Horizon Hobby)	INFRACTION GROM 3S BLX 4X4 RTR
Scale / type	1/12, All-Road street basher
Drive	4WD, sealed center differential with metal spur gear
Motor	Spektrum Firma 2838 4350Kv brushless
ESC / receiver	Spektrum SLT 2-in-1 40A ESC and receiver
Transmitter / servo	Spektrum SLT2 with DSC / SX114 servo
Top speed (claimed)	30+ MPH Adrenaline Mode, 50+ MPH Chaos Mode
Battery	3S LiPo, IC2 connector
Gearing	27T pinion, 59T spur, MOD 0.5, 2.19:1 gear ratio
Size (L x W x H)	382 x 174 x 118 mm (15.04 x 6.85 x 4.65 in)
Wheelbase	222 mm (8.74 in)
Weight	2.6 lb (1.17 kg) RTR; 2.8 lb (1.27 kg) battery bundle
Suspension	Double wishbone, four-wheel independent, oil-filled shocks
Spring rates	Front 23.3 lb/in (4.08 N/mm), rear 17.36 lb/in (3.04 N/mm)
Chassis	Composite
Tires / hex	dBoots Hoons white compound belted / aluminum 12 mm
Steering	2-wheel steering
Water resistance	Water-resistant (per Horizon specs)

All figures come from Horizon Hobby’s ARA2315 product page and the ARA2315S battery bundle page, checked on Oct 30, 2026.

Price and Versions

Horizon sells the INFRACTION GROM 3S in three listings:

Version	Details (Oct 30, 2026)
RTR ARA2315	Price: $249.99 Color: Blue/Red Includes: no battery or charger
RTR with battery and charger ARA2315S	Price: $289.99 Colors: Red/Black or Yellow/Black Includes: a Spektrum Smart 1300mAh 3S 30C LiPo (IC2) and an S22 Mini USB-C 3S charger
Limited Edition ARA2315ST3	Price: same as ARA2315S Color: Blue/Black iridescent Includes: a second 3S battery; HorizonHobby.com exclusive, listed as sold out

The $40 gap between the RTR and the battery bundle covers one battery and a charger. Horizon lists a compatible USB power supply and a LiPo safe bag as still needed for both versions, so budget for those too if you don’t already have them.

The Limited Edition Blue/Black version has an iridescent body that Horizon says shifts in the light. Horizon lists it as exclusive to HorizonHobby.com with a free extra Spektrum Smart 1300mAh 3S battery at the same price as the bundle. It still showed “SOLD OUT!” when checked on Oct 30, 2026.

Release Date

The INFRACTION GROM 3S was released on October 28, 2026, per Horizon Hobby’s EU store listing for the ARA2315, which showed “Pre-Order | Releasing October 28, 2026” before launch. When checked on Oct 30, 2026, Horizon’s US and EU product pages listed the ARA2315 RTR as In Stock, and the US ARA2315S battery bundle was orderable. Stock levels change quickly after a launch, so check the product page for current availability before you order.

PowerGuard: Two Speed Modes

PowerGuard is ARRMA’s speed-management system. Horizon says it first appeared on the MINI KRATON and is built into the INFRACTION GROM 3S from the start. It works in two steps:

Adrenaline Mode is the out-of-the-box setting. Horizon rates it at 30+ MPH and says it suits beginners.
Chaos Mode unlocks when you insert the included PowerKey. Horizon calls it “real, verified 50+ MPH”. That figure is the manufacturer’s claim; real speed depends on battery, gearing and surface.

That makes the Grom an easy car to share. A newer driver can start in Adrenaline Mode, and the owner can hold on to the PowerKey until they are ready for more speed.

Spektrum DSC Stability Control

The included Spektrum SLT2 transmitter supports Dynamic Stability Control (DSC). Horizon lists four selectable modes, from off (no correction, full manual control) up to high (the most correction). DSC applies steering correction automatically to keep slides under control. You can turn it down as your driving improves or leave it on. On a small, fast 4X4 car built for drifting on pavement, that is a useful feature for beginners.

Chassis, Drivetrain and Suspension

According to Horizon, the INFRACTION GROM 3S uses:

A sealed center differential with a metal spur gear, plus easy-access front and rear differentials
An enclosed 4X4 drivetrain, which Horizon says keeps dirt out
A composite chassis with front and rear bumpers and a body location system
Double wishbone four-wheel independent suspension with oil-filled shocks
Aluminum 12 mm wheel hexes
dBoots Hoons white compound belted tires for pavement grip
A quick-release, clipless body for fast battery swaps and chassis access

The 2838 4350Kv motor drives a 27T pinion and a 59T MOD 0.5 spur, for a listed gear ratio of 2.19:1. Horizon lists front springs at 23.3 lb/in and rear springs at 17.36 lb/in, so the front is stiffer than the rear from the factory.

Batteries and the SmartFit System

The Grom runs on a 3S LiPo with an IC2 connector. Horizon says the SmartFit click-out battery system holds the pack without straps. The battery tray measures 100 x 34 x 20.3 mm (3.93 x 1.34 x 0.80 in). Horizon also lists a larger maximum battery size of 112 x 34 x 22.5 mm (4.41 x 1.34 x 0.88 in) when you use the optional ARA-1418 strap.

If you buy the battery bundle (ARA2315S), you get a Spektrum Smart 1300mAh 3S 30C hard case LiPo and an S22 Mini USB-C 3S charger. The charger needs a compatible USB power supply, which is not included. The Horizon RTR page suggests the Spektrum 11.1V 1300mAh 3S 30C Smart G2 LiPo with the IC2 SmartFit case for owners who buy the base RTR. For a wider look at Grom packs and connectors, see our Grom battery compatibility guide.

ARRMA INFRACTION GROM 3S BLX 4X4 RTR (ARA2315 / ARA2315S)

$249.99 RTR or $289.99 battery bundle at Horizon (checked Oct 30, 2026)
30+ / 50+ MPH manufacturer ratings with PowerGuard
3S IC2 battery, SmartFit click-out tray

Check current price on Amazon

LiPo charging bag (any fireproof LiPo bag)

Listed by Horizon as needed for both versions
Charge and store packs inside it

Check current price on Amazon

Infraction Grom vs the Full-Size Infraction

The name is the same, but the size is very different. Horizon’s 1/7 INFRACTION 6S BLX page rates the full-size car at 80+ MPH on 6S power, while the Grom is a 1/12 scale car rated at 50+ MPH on 3S and weighing 2.6 lb. The Grom runs on small 3S packs and fits in a much smaller space, but it is not a replacement for the 1/7 car. For the big car, read our ARRMA Infraction review.

Who the Infraction Grom 3S Is For

Based only on what Horizon publishes, the INFRACTION GROM 3S lines up best with these buyers:

Street and pavement drivers. Horizon describes it as an all-road street basher, and it ships on dBoots Hoons white compound belted tires made for pavement grip.
People short on space. At 1/12 scale it measures 382 x 174 x 118 mm and weighs 2.6 lb as an RTR, so it is easy to carry and store.
Newer drivers and shared households. Horizon says Adrenaline Mode (30+ MPH) is great for beginners, the PowerKey holds back Chaos Mode (50+ MPH) until you choose to unlock it, and DSC adds up to four levels of steering correction.
Owners who want small 3S packs. It runs on a single 3S LiPo with an IC2 connector, and the ARA2315S bundle includes a 1300mAh pack and a USB-C charger.
Full-size Infraction fans. Horizon pitches it to INFRACTION diehards looking to add a small-scale bash buddy, and to drivers graduating from their first RC car.

If you want a 1/7 scale car or 6S speed ratings, look at the full-size INFRACTION instead (covered above).

How It Fits the Grom Lineup

The INFRACTION GROM joins other ARRMA GROM models, and Horizon says it is the first all-road version, built for street bashing. If you are choosing between a Grom and a full-size Infraction as a first serious RC car, our Grom vs Infraction buying guide looks at that decision. To compare the off-road Groms, see our Mojave Grom vs Typhon Grom showdown and our Typhon Grom guide.

Frequently Asked Questions

How much is the ARRMA Infraction Grom?

On Oct 30, 2026, Horizon Hobby listed the INFRACTION GROM 3S RTR (ARA2315) at $249.99 without a battery or charger, and the battery bundle (ARA2315S) at $289.99 with a Spektrum 1300mAh 3S LiPo and an S22 Mini USB-C charger.

When is the ARRMA Infraction Grom release date?

The INFRACTION GROM 3S was released on October 28, 2026, per Horizon Hobby’s EU store listing. When checked on Oct 30, 2026, Horizon’s US and EU pages listed the RTR as In Stock, and the US battery bundle was orderable.

How fast is the ARRMA Infraction Grom 3S?

Horizon rates it at 30+ MPH in Adrenaline Mode out of the box and 50+ MPH in Chaos Mode, which you unlock with the included PowerKey. These are manufacturer ratings.

What battery does the Infraction Grom use?

A 3S LiPo with an IC2 connector. The SmartFit tray fits packs up to 100 x 34 x 20.3 mm, or up to 112 x 34 x 22.5 mm with the optional ARA-1418 strap. The ARA2315S bundle includes a Spektrum Smart 1300mAh 3S 30C hard case LiPo.

Is the Infraction Grom the same as the full-size ARRMA Infraction?

No. The Grom is a 1/12 scale, 3S car that is 382 mm long and weighs 2.6 lb. The full-size INFRACTION 6S is a 1/7 scale car that Horizon rates at 80+ MPH on 6S.