HPI Racing 66T Spur Gear Suits RS4 Sport 3 Flux 113706

The HPI Racing 66T Spur Gear is a genuine replacement transmission gear designed for the HPI RS4 Sport 3 Flux platform. It restores the standard spur gear setup when the original gear becomes worn, damaged or stripped.

This 48-pitch spur gear can also be installed in standard brushed RS4 Sport 3 models when used with a compatible pinion gear between 31 and 37 teeth. Correct gear mesh and suitable gearing are essential for smooth drivetrain operation and reliable performance.

Features

• Genuine HPI Racing replacement part
• 66-tooth spur gear
• Designed as a replacement for RS4 Sport 3 Flux models
• Compatible with standard RS4 Sport 3 models when correctly geared
• Uses standard 48-pitch pinion gears
• Restores smooth power transfer through the drivetrain
• Ideal for replacing a worn, stripped or damaged original spur gear

Specifications

• Brand: HPI Racing
• Product: Spur Gear
• Manufacturer Part Number: 113706
• SKU: HPI-113706
• Barcode: 4944258028934
• Tooth Count: 66T
• Gear Pitch: 48 Pitch
• Application: RS4 Sport 3 drivetrain
• Part Type: Replacement spur gear

Compatibility

• HPI RS4 Sport 3 Flux models using the 66T spur gear
• HPI Sport 3 Creator Edition
• Selected HPI Sport 3 Flux touring car models
• Selected HPI Sport 3 Drift models
• Standard brushed HPI RS4 Sport 3 models when used with a 31T to 37T 48-pitch pinion

Includes

• 1 × HPI Racing 66T spur gear

FAQ

Which vehicle is this spur gear designed for? It is designed as a replacement 66T spur gear for HPI RS4 Sport 3 Flux models.

Will it fit a standard brushed RS4 Sport 3? Yes, but HPI specifies that it must be used with a pinion gear between 31T and 37T.

What pitch pinion gear is required? Use a compatible 48-pitch pinion gear.

Is a pinion gear included? No. This package includes the spur gear only.

Why do spur gears become damaged? Common causes include incorrect gear mesh, loose motor mounting screws, debris in the drivetrain, excessive drivetrain resistance or unsuitable gearing.

How should the gear mesh be adjusted? Set a small amount of free movement between the spur and pinion gears. The gears should rotate smoothly without binding while remaining fully engaged across the tooth width.

Can I use a pinion smaller than 31T on a standard RS4 Sport 3? HPI specifies a compatible range of 31T to 37T when this spur gear is installed in a standard RS4 Sport 3. Using gearing outside this range may prevent correct motor positioning or gear mesh.

Important Notes

• Pinion gear is not included.
• Standard RS4 Sport 3 models require a 31T to 37T 48-pitch pinion with this spur gear.
• Check the existing spur gear tooth count and vehicle configuration before ordering.
• Set the gear mesh correctly before operating the vehicle.
• Inspect the pinion gear for damaged or sharp teeth before fitting a new spur gear.
• Confirm the motor mount is secure after adjusting the gear mesh.
• Vehicle and other drivetrain components are not included.