SPIDER Automation | 48P 25T Steel Pinion Gear for 1/10 Scale RC Cars | 3.17mm Bore
The SPIDER Automation 48P 25T Steel Pinion Gear is a motor-side drivetrain component designed for compatible 1/10 scale radio-controlled cars. It transfers rotational power from the motor to the mating spur gear and provides a 25-tooth gearing option for configuring the vehicle’s transmission.
This pinion uses a 48-pitch (48P) tooth profile and has a specified 3.17mm internal bore. The supplier also references a 2.7mm motor shaft diameter. Because the bore and shaft dimensions are different, the mounting arrangement must be checked carefully before purchase and installation.
Product Overview & Functional Characteristics
A pinion gear is fitted to the motor shaft and meshes with the vehicle’s spur gear to transfer rotational motion into the drivetrain. The tooth count of the pinion works together with the spur gear tooth count to determine the overall gear ratio.
This 25T pinion provides a specific gearing option for RC vehicle setup and tuning. It is intended for use with a matching 48P spur gear, as gear pitch compatibility is necessary for correct tooth engagement.
Technical Features & Design Details
- 25-Tooth Gear: Provides a 25T motor pinion configuration for compatible RC drivetrain setups.
- 48P Tooth Profile: Designed for engagement with a matching 48-pitch spur gear.
- Metal Construction: Made from metal, with steel identified in the supplied package description.
- 3.17mm Internal Bore: Specified bore size for checking motor shaft and mounting compatibility.
- 2.7mm Motor Shaft Reference: The supplier lists a 2.7mm motor shaft reference, which differs from the specified bore dimension.
- Black Finish: Black-coloured appearance for RC drivetrain assemblies.
- Gearing Adjustment: Allows a 25T pinion option when configuring a compatible motor and spur gear combination.
Understanding Pinion Gear Ratio
The pinion and spur gear tooth counts determine the gear reduction ratio. For example, a 25T pinion paired with a 75T spur gear produces a 3:1 gear ratio. The actual ratio depends on the tooth count of the selected spur gear.
Changing the pinion tooth count can alter the relationship between motor speed and drivetrain torque. The final gearing selection should account for the motor, vehicle setup, operating load and temperature.
Applications
This pinion is intended for compatible 48P gear systems used in model vehicle drivetrain assemblies.
- 1/10 Scale RC Cars: Motor-side pinion gear for compatible 1/10 scale radio-controlled car drivetrains.
- RC Gear Ratio Tuning: Provides a 25T option for adjusting the pinion-to-spur gear ratio.
- Electric RC Vehicles: Suitable for compatible electric model vehicles using a 48P transmission system.
- RC Car Maintenance: Replacement pinion for servicing compatible motor and spur gear assemblies.
- Custom RC Builds: Gearing component for custom model vehicle projects using matching 48P gears.
Package Includes
- 1 × 48P 25T Steel Pinion Gear with 3.17mm Bore
Product Specifications
| Parameter | Specification |
|---|---|
| Product Type | RC Motor Pinion Gear |
| Gear Pitch | 48P (48 Pitch) |
| Number of Teeth | 25T |
| Internal Bore Diameter | 3.17mm |
| Referenced Motor Shaft Diameter | 2.7mm |
| Material | Metal (Steel identified in package description) |
| Colour | Black |
| Intended Vehicle Scale | 1/10 Scale RC Cars |
| Compatible Mating Gear | Matching 48P Spur Gear |
| Package Quantity | 1 Piece |
Installation & Operating Recommendations
Correct pinion installation requires matching the motor shaft, pinion bore and mating spur gear. Check the mounting arrangement and gear engagement before applying power to the RC vehicle.
- Check Motor Shaft Compatibility: Compare the actual motor shaft diameter with the 3.17mm pinion bore. The supplier’s 2.7mm shaft reference does not establish a direct fit.
- Use a Suitable Mounting Arrangement: If the motor shaft is smaller than the pinion bore, use an appropriate compatible reducer or mounting solution rather than relying on a loose fit.
- Match Gear Pitch: Use with a 48P spur gear. Do not assume compatibility with gears of a different pitch.
- Check Gear Mesh: Set suitable clearance between the pinion and spur gear to avoid excessive tightness or looseness.
- Secure the Pinion: Use the correct retention method for the motor shaft and pinion design.
- Check Alignment: Ensure the pinion and spur gear are aligned correctly across their face widths.
- Test Before Driving: Rotate the drivetrain manually and perform an initial low-load test while monitoring for abnormal noise, vibration or heating.
