Arrma Granite Grom Mega 380

Stock is as the vehicle ships. Calculated is worked from the stock figures on this page rather than stored beside them, so the two cannot drift apart. Not applicable means the vehicle does not come with it, like the motor on a roller or the tires on a race kit, or does not have one, like a KV rating on a brushed motor. Not published means it exists but no source we could find prints it.

How these numbers were settled

The 1/18 Grom platform shares nothing but a name with the 1/10 Granite 3S BLX V3.

• Horizon publishes the Arrma Mega 380 28T brushed motor, so KV does not apply: a brushed can has no KV rating.
• The cell count still applies and is 2S, from the Spektrum waterproof SLT 2-in-1 25A ESC/receiver and the supplied 7.4V 2S pack; top speed claim 20+ mph.
• The 16T pinion and 59T spur are both community-sourced, from Castle Creations' vehicle page for this car, which quotes 16T/59T and notes that an optional motor mount is required for anything other than the stock 16T pinion; that remark is why the 16T is read as factory rather than as one of Castle's own recommendations.
• The transmission and axle ratio is left blank: this is a 4WD shaft car, so there is certainly a diff reduction after the spur, but Arrma publishes no figure and no exploded-view tooth counts for the Grom diffs were found, so the final drive cannot be computed either.
• No published tire diameter was found.

Sources

• ARA2102horizonhobby.com (opens in a new tab)
• arrma-granite-grom-1-18thcastlecreations.com (opens in a new tab)

Every figure on this page traces to one of these. Where they disagreed, the note above says which was used and why.

More from Arrma

• Felony 6S BLX
• Fireteam 6S BLX
• Gorgon 2WD
• Granite 3S BLX V3
• Infraction 4x4 3S BLX
• Infraction 6S BLX
• Infraction 6S V2
• Kraton 4S BLX V2