1. Introduction
This manual provides essential information for the proper use, installation, and maintenance of your HPI Racing B085 Ball Bearings. These precision-made ball bearings are designed to HPI factory specifications, ensuring a perfect fit and reliable performance in compatible HPI Racing remote-controlled vehicles.
The HPI B085 Ball Bearing is a genuine HPI quality spare part, crucial for the smooth operation and longevity of your RC vehicle's moving components. Each bearing measures 8mm (inner diameter) x 16mm (outer diameter) x 5mm (width).

Image 1.1: HPI Racing B085 Ball Bearing. This image displays two individual ball bearings, highlighting their metallic construction and standard design.
2. Setup and Installation
Proper installation of ball bearings is critical for optimal performance and durability. Always refer to your specific HPI Racing vehicle's assembly manual for detailed, model-specific installation instructions.
General Installation Guidelines:
- Preparation: Ensure the housing or component where the bearing will be installed is clean and free of debris, old grease, or foreign particles.
- Orientation: Verify the correct orientation of the bearing before installation.
- Press Fit: Ball bearings are typically press-fit into their housings. Use appropriate tools (e.g., a bearing press or a socket slightly larger than the outer race) to apply even pressure. Do not use excessive force or strike the inner race, as this can damage the bearing.
- Shaft Installation: When installing onto a shaft, apply pressure to the inner race only.
- Lubrication: While these bearings are pre-lubricated, a light application of appropriate bearing oil or grease during installation can aid in seating and initial operation.
- Verification: After installation, ensure the bearing rotates freely and smoothly without binding or excessive play.
These bearings are designed for a perfect fit in applications requiring 8x16x5mm bearings. Confirm compatibility with your vehicle's specifications before installation.
3. Operating Considerations
Ball bearings are passive components that facilitate smooth, low-friction rotation within your RC vehicle's drivetrain, wheels, or other moving parts. Their 'operation' is continuous as long as the vehicle is in motion.
- Smooth Function: Properly installed and maintained bearings will allow components to rotate freely, reducing energy loss and heat generation.
- Load Bearing: These bearings are designed to withstand the radial and axial loads typically encountered in HPI Racing RC vehicles.
- Environmental Factors: Operating in dusty, wet, or extremely dirty conditions can accelerate wear. Regular inspection and cleaning are recommended for such environments.
4. Maintenance
Regular maintenance extends the lifespan and ensures the optimal performance of your HPI Racing B085 Ball Bearings.
Maintenance Steps:
- Inspection: Periodically inspect bearings for signs of wear, damage, or contamination. Look for rough rotation, excessive play, or visible corrosion.
- Cleaning: If bearings become dirty, carefully remove them from their housing. Use a suitable bearing cleaner or solvent to remove old grease and debris. Allow them to dry completely.
- Lubrication: After cleaning, apply a small amount of high-quality RC bearing oil or light grease. Do not over-lubricate, as this can attract more dirt.
- Replacement: If a bearing exhibits significant roughness, binding, or excessive play even after cleaning and lubrication, it should be replaced immediately to prevent damage to other components.
5. Troubleshooting
If you experience issues related to bearing performance, consider the following troubleshooting steps:
- Rough or Gritty Rotation:
- Cause: Dirt, dust, or debris inside the bearing. Lack of lubrication.
- Solution: Remove, clean, and re-lubricate the bearing. If the issue persists, replace the bearing.
- Excessive Play (Wobble):
- Cause: Worn bearing races or balls. Incorrect bearing size for the application.
- Solution: Replace the bearing. Ensure the correct bearing size (8x16x5mm) is used.
- Binding or Sticking:
- Cause: Improper installation (e.g., cocked in the housing, excessive press fit). Damaged bearing.
- Solution: Re-install the bearing carefully, ensuring it is seated squarely. If damaged, replace it.
- Unusual Noise (Whining, Grinding):
- Cause: Worn, dry, or contaminated bearing.
- Solution: Clean and lubricate. If noise persists, replace the bearing.
6. Specifications
| Brand | HPI Racing |
| Model Number | HPIB085 |
| Bearing Type | Ball Bearing |
| Dimensions (Inner x Outer x Width) | 8mm x 16mm x 5mm |
| Item Weight | Approximately 0.32 ounces (0.02 lbs) per pair |
| Recommended Age | 10 years and up |
| UPC | 885940540133, 787793297489, 885411269792, 696748253084 |
| Date First Available | December 17, 2004 |
| Discontinuation Status | Discontinued by Manufacturer |
7. Warranty and Support
Specific warranty terms for the HPI Racing B085 Ball Bearing are not provided in this manual. For warranty information, please consult the retailer where the product was purchased or contact HPI Racing directly through their official support channels.
For technical support, parts inquiries, or further assistance with HPI Racing products, please visit the official HPI Racing website or contact their customer service department. Always provide your product model number (HPIB085) when seeking support.
Important Note: As this product is listed as 'Discontinued by Manufacturer', availability of direct manufacturer support or warranty claims may be limited. Please verify with your point of purchase or HPI Racing for current policies.