Replacement Gear Set For RS390 Motor And WW3 WW4 Gearbox For Children Electric Vehicles Includes 8 Tooth Small Gear 50 Tooth Middle Gear 44 Tooth Large Gear Durable Kid Friendly Toy Car Gear Kit For Easy Upgrades And Smooth Acceleration
Included gears and exact specs
- Small gear: 8 teeth, diameter 1.89 in (4.8 cm)
- Middle gear: 50 teeth, diameter 2.05 in (5.2 cm)
- Large gear: 44 teeth, diameter 2.72 in (6.9 cm)
Why this gear set stands out
This replacement kit is engineered specifically for RS390 motors paired with WW3 WW4 gearboxes, ensuring a precise fit and reliable operation. The three‑gear configuration provides a balanced gear ratio that supports smooth acceleration without abrupt power spikes, which helps kids feel in control and reduces wheel spin on varied surfaces.
- Durable, kid‑friendly construction: Built to endure the bumps and quick starts typical of children's electric vehicles, with a white finish that blends cleanly with many car bodies.
- Complete upgrade in one kit: Rather than swapping single gears, this set gives you the full array needed for a meaningful, performance‑based upgrade.
- Enhanced acceleration and control: The 8‑tooth, 50‑tooth, and 44‑tooth combination delivers a more stable power transfer, helping the car accelerate smoothly and maintain steady speed.
- Reliable compatibility: Specifically designed for RS390 motors and WW3 WW4 gearboxes, so installation is straightforward and dependable.
Ideal use cases
Perfect for families who like to refresh worn drivetrain components in kids’ electric vehicles, especially when the vehicle starts to feel sluggish or gears begin slipping. It’s a practical upgrade for hobbyists who customize toy cars, teaching kids about simple mechanical components through hands-on maintenance. Suitable for commonly used kids’ ride‑on cars that run RS390 motors with WW3 or WW4 gearboxes.
Practical tips for installation and care
- Before installing, inspect both the motor shaft and gearbox sockets for wear. Replace any damaged parts to prevent misalignment.
- Apply a light coat of silicone-based lubricant to gear teeth after installation to reduce friction and extend life.
- Align gears carefully to avoid binding: test by rotating the drivetrain by hand before reassembling the chassis.
- Re-torque fasteners to the manufacturer’s recommended specs to maintain proper mesh and prevent gear creep during use.
With this Replacement Gear Set, you’re not just swapping worn components, you’re restoring performance, extending the life of the vehicle, and giving young drivers a smoother, more confident ride. The kit’s three precisely matched gears provide a thoughtfully engineered upgrade that stands out from generic replacements, helping kids accelerate with control and enjoy longer play sessions.