45# Steel Gearbox Main Gear 39T/40T/41T – LOSI 1/10 LOS03028
45# Steel Gearbox Main Gear 39T/40T/41T – LOSI 1/10 LOS03028
45# Carbon Steel Gearbox Internal Main Gear for LOSI 1/10 RC Cars
Upgrade or replace the gearbox internal main gear on your LOSI 1/10 LASERNUT TENACITY ULTRA 4 ROCK RACER (LOS03028) with this precision-cast, hardened 45# carbon steel bevel gear. Available in 39T, 40T, and 41T tooth configurations, each variant is machined to tight tolerances for smooth, reliable gear engagement and powerful, stable transmission performance — even under demanding off-road conditions.
Key Features
- Material: Hardened 45# Carbon Steel — delivers excellent sturdiness and long-lasting durability under high-load RC driving
- Precision Casting: Accurate tooth profiles ensure smooth, consistent gear engagement and stronger power transmission
- Bevel Gear Design: Standard bevel tooth profile for direct compatibility with the LOSI LOS03028 gearbox assembly
- Three Tooth Options: Choose 39T (≈29.7g), 40T (≈32.5g), or 41T (≈35.5g) to match your exact drivetrain needs
- OEM Reference Numbers: LOS232025 (39T) · LOS232025 (40T) · LOS232025 (41T)
- Direct Replacement: Designed specifically for LOSI 1/10 LASERNUT TENACITY ULTRA 4 ROCK RACER — no modification required
Specifications
| Material | 45# Carbon Steel (Hardened) |
| Tooth Profile | Bevel Gear |
| Processing | Precision Casting |
| Available Tooth Counts | 39T / 40T / 41T |
| Weight (39T) | ≈ 29.7g |
| Weight (40T) | ≈ 32.5g |
| Weight (41T) | ≈ 35.5g |
| Compatible Model | LOSI 1/10 LASERNUT TENACITY ULTRA 4 ROCK RACER LOS03028 |
| Country of Origin | Made in China |
Compatibility
This gearbox main gear is specifically engineered for the LOSI 1/10 LASERNUT TENACITY ULTRA 4 ROCK RACER – LOS03028. Please verify your model number before purchasing to ensure a perfect fit.
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Frequently Asked Questions
Q: Which LOSI RC car models is this gearbox main gear compatible with?
A: This gearbox internal main gear is specifically designed for the LOSI 1/10 LASERNUT TENACITY ULTRA 4 ROCK RACER (LOS03028). Always confirm your model number before ordering to ensure correct fitment.
Q: What is the difference between the 39T, 40T, and 41T options?
A: The tooth count (39T, 40T, or 41T) affects gear ratio and transmission characteristics within the gearbox. A higher tooth count generally provides a different torque and speed balance. Select the tooth count that matches your original gear or desired drivetrain tuning for the LOSI LOS03028.
Q: Why is 45# carbon steel used for this gearbox gear?
A: 45# carbon steel is a hardened, medium-carbon steel known for its high strength, excellent wear resistance, and dimensional stability. It is a proven choice for precision RC drivetrain components, ensuring the gear maintains accurate tooth profiles and withstands repeated high-load engagement without deforming or wearing prematurely.
Q: Is this a genuine LOSI OEM part or an aftermarket replacement?
A: This is an aftermarket replacement part manufactured to match OEM specifications and reference numbers (LOS232025). It is designed as a direct-fit replacement but is not produced or endorsed by LOSI/Horizon Hobby.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.