HPI Racing Monster King Big Kahuna Ford Bronco 4400

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.

Gearing parts

Tooth counts are the ones in the specifications above. Pitch is given as metric module (Mod 1, Mod 0.8) or diametral pitch (32P, 48P). They are different standards and are not interchangeable, even where the numbers look close. Bore is the pinion’s hole, listed separately from the motor shaft. Linked part numbers go to the maker's or official distributor's page for that part.

How these numbers were settled

Brushed Firebolt 12T 550 motor, which carries a turn count rather than a KV rating.

• HPI's standard parts list and the technical guide's parts list both name a 21T 48-pitch pinion (6921) and a 90T 48P spur (115316).
• The center gearbox drive gears (85259) and the axle final gear sets (38T/13T, A855) are listed, but the drive gear tooth counts are not published, so the transmission and axle ratio and the total are left blank.
• The SC-3SWP2 ESC's part page rates it for 2S or 3S LiPo, but the product page says 2S at most with the brushed motor, so 2S is shown.
• Tires are Tredz TRZ 135x86mm (160770).
• The user guide gives the stock shock oil as equal to 300cst while the parts lists name a 700cst oil, so the shock oil is left blank.

Documents

• ManualMonster King user guide (HPI PDF) (opens in a new tab)Motor and pinion, p. 11
• Parts listMonster King technical guide, parts list (HPI PDF) (opens in a new tab)p. 3
• Exploded viewMonster King technical guide, exploded views (HPI PDF) (opens in a new tab)pp. 4-16

Sources

• 160765hpiracing.com (opens in a new tab)
• stdhpiracing.com (opens in a new tab)
• Manual (PDF)hpiracing.com (opens in a new tab)
• 6921hpiracing.com (opens in a new tab)
• 115316hpiracing.com (opens in a new tab)
• A855hpiracing.com (opens in a new tab)
• 160770hpiracing.com (opens in a new tab)
• 114712hpiracing.com (opens in a new tab)
• 160773hpiracing.com (opens in a new tab)
• 160769hpiracing.com (opens in a new tab)
• Manual (PDF)hpiracing.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.

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