6805-RD Bike Bottom Bracket Bearing 25x37x6mm HT2 BB51
6805-RD Bike Bottom Bracket Bearing 25x37x6mm HT2 BB51
6805-RD Deep Groove Ball Bearing for Bicycle Bottom Brackets
Upgrade or replace your bike's bottom bracket with this precision-engineered 6805-RD bearing (25x37x6mm). Designed specifically for HT2 and BB51 bottom bracket systems, this bearing delivers smooth, consistent pedaling performance for road, mountain, and commuter bikes alike. Also referenced as MR25376 and SC6805N, it fits a wide range of compatible crankset and bottom bracket assemblies.
Key Specifications
- Model: 6805-RD / MR25376 / SC6805N
- Structure: Deep Groove Ball Bearing
- Material: High-grade bearing steel
- Inner Diameter: 25mm
- Outer Diameter: 37mm
- Thickness: 6mm
- Closures: Rubber sealed (RD) – keeps out dirt, dust, and moisture
- Lubrication: Pre-greased for low-friction, ready-to-install performance
- Dynamic Load Rating (Cr): 4,150 N
- Static Load Rating (Cor): 2,382 N
- Compatible Systems: HT2, BB51
- Package Includes: 1 × Bearing
Why Choose This Bearing?
- ✅ Precision fit – exact 25x37x6mm dimensions for HT2 / BB51 bottom bracket compatibility
- ✅ Rubber sealed – dual-contact rubber seals lock in grease and block contaminants for longer service life
- ✅ Pre-greased – install and ride right away with no additional lubrication needed
- ✅ Bearing steel construction – high hardness and wear resistance for demanding cycling conditions
- ✅ Compact & lightweight – minimal added weight while maximizing rotational efficiency
Compatibility Notes
This bearing is compatible with HT2 (Shimano Hollowtech II style) and BB51 bottom bracket cups, and other crankset systems using a 25mm inner diameter / 37mm outer diameter / 6mm width bearing. Always verify your bottom bracket specifications before ordering.
Made in Mainland China.
Related Products You May Like
- 360° Bicycle Chain Cleaner Tool | Bike Gear Cleaning Kit
- 60cm Motorcycle Luggage Strap – Elastic Helmet Bungee Net
- Air Compressor Pressure Gauge 0-10/0-12/0-25 Bar | DIY Tool
Note: Due to manual measurement, please allow a tolerance of 1–3mm. Product color may vary slightly from images due to different monitor calibrations.
Learn more: HHS Move Your Way physical activity guidance
Frequently Asked Questions
Q: What bike bottom bracket systems is the 6805-RD bearing compatible with?
A: The 6805-RD bearing (25x37x6mm) is specifically designed for HT2 and BB51 bottom bracket systems. It is also sold under the model numbers MR25376 and SC6805N. Always confirm your bottom bracket's inner diameter (25mm), outer diameter (37mm), and width (6mm) before installing.
Q: Is this bearing pre-lubricated and ready to install?
A: Yes. The 6805-RD bearing comes pre-greased and features rubber seals that retain the grease and keep out contaminants. It is ready to install straight out of the package — no additional lubrication is required before use.
Q: How do I know if my bottom bracket needs a new bearing?
A: Common signs that your bottom bracket bearing needs replacement include rough or grinding sensations while pedaling, lateral play in the crankset, or unusual noise during riding. Replacing a worn bearing with a correctly sized 25x37x6mm deep groove ball bearing restores smooth and efficient pedaling performance.