Can the motor be replaced or upgraded?

Thank you for the inquiry. Yes, the motor can be replaced or upgraded to brushless but you need a brushless ESC. We suggest using the factory version motor.

Whats the biggest wheel size i can go up to with the 903a model?

I wouldn’t go much taller because it puts more drag on the motor and makes it hot

Is it possible to get a replacement motor or upgrade it to a different one?

Thank you for the question. Yes, the replacement motor should be a brushed 390 motor or brushless motor which is not larger than the original motor.

What's the battery size compartment? Or what are the dimensions of the batteries that come with 903a?

The battery size is 2S, 1600 mAh 30C 7.4 volts. Battery dimensions are about 1-1/4" x 2-3/4", or about 34 mm x 70 mm, and the compartment is about 1-1/2" x 2-3/4", or 38 mm x 70 mm, with a lot of over-head space (where the cab lines up).

Haiboxing 903 1 12 Scale Remote Control Truck 38 Km

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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₨119465

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Sold byAmazon Sri LankaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚀 Dominate Every Terrain with Speed, Power & Precision!

PRECISION 4 WD CONTROL - Experience full proportional steering and throttle with an independent 3-wire servo for razor-sharp handling on any terrain.
RACE READY 38 KM H SPEED - Feel the adrenaline with a powerful 390 motor pushing this 1:12 scale beast to thrilling speeds.
EXTENDED PLAYTIME DUAL BATTERIES - Keep the fun going with two 7.4V 1500mAh Li-ion batteries delivering over 40 minutes of non-stop off-road action.
RACE TOGETHER WITHOUT INTERFERENCE - 2.4GHz radio system offers a 280-feet control range with interference-free multi-player racing excitement.
RUGGED DURABILITY MEETS SMOOTH RIDE - Aluminum oil-filled shocks and 16 ball bearings ensure superior shock absorption and frictionless power transfer.

The HAIBOXING 903 is a 1:12 scale 4WD off-road RC truck powered by a 390 motor, reaching speeds up to 38 km/h. Equipped with dual 7.4V 1500mAh Li-ion batteries, it offers over 40 minutes of continuous play. Its full metal gear drivetrain, aluminum oil-filled shocks, and 16 ball bearings provide durability and smooth handling across gravel, sand, and grass. The 2.4GHz radio system supports interference-free multi-player racing up to 280 feet, while IPX4 splash resistance and advanced electronic protections ensure reliable, safe fun for both beginners and hobbyists.

Specifications

ASIN	B0BCGR253J
Additional Features	Portable
Age Range Description	Kid
Battery Description	Lithium-Ion
Best Sellers Rank	#72,463 in Toys & Games ( See Top 100 in Toys & Games ) #124 in Hobby RC Trucks
Brand Name	HAIBOXING
Color	903
Customer Package Type	Box
Customer Reviews	4.5 4.5 out of 5 stars (854)
Included Components	Battery, Charger, Product Manual, Remote, Screwdriver
Indoor Outdoor Usage	Outdoor
Item Dimensions	13.4 x 11 x 6.7 inches
Item Highlight	Aluminum Oil-Filled Shocks, 4X4 RC Monster Truck for Boys& Adults, 2.4 GHz Water-Resistant ESC, Dual Batteries 40+ Min Play
Item Type Name	RC Trucks
Item Weight	4.5 pounds
Manufacturer	Shantou Haiboxing Technology&Education Model Co., Ltd.
Manufacturer Part Number	903
Manufacturer Warranty Description	30 Day Warranty Against Manufacturer Defects
Manufacturer recommended age	8 years and up
Material Type	Aluminum, Metal, Plastic
Maximum Speed	38 kilometers per hour
Model Name	903
Model Number	903
Model Year	2022
Number of Batteries	1 Lithium Ion batteries required. (included)
Number of Items	1
Number of Packs	1
Number of Players	Multiple
Operation Mode	manual
Power Source	Battery Powered
Scale	1:12 Scale
Size	11 x 13.4 x 6.7 inches
Subject Character	Monster
Theme	car, off-road, train, truck
Toy Vehicle Form	Truck
Unit Count	1 Count

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