[Abu] "Kattobi" Spool Bearing Kit - AIR BFS-Si - [1030AIR BFS-Si & 1030AIR BFS-Si] [AIR BFS-Si Ceramic Bearing] for Ambassadeur 4000C-6500C Old Model

| Product Concept

*Comes with a tuning manual, making it easy for first-time users to replace bearings.
*This is a set of two tuning bearings designed exclusively for baitcasting reel spools.
*If you don’t own a pin remover tool, we recommend purchasing it together.
→ Click here for details about the spool bearing remover.




AIR Bearings are ultra-high-speed bait finesse bearings ideal for lures ranging from 1g to approximately 28g.

Thanks to the adoption of small-diameter Japanese-made ceramic balls and a high-strength integrated housing, these bearings are not only perfect for bait finesse but also provide the rotational responsiveness to cast ultra-lightweight lures. At the same time, they allow you to cast 1oz-class lures with the same feel as regular bearings.

These versatile bearings excel in various scenarios. Once you cast with them, you will notice the difference—experience the ultimate rotational responsiveness of AIR Bearings.

*“AIR Bearings” are registered trademarks and design-registered products of HEDGEHOG STUDIO.








The AIR BFS-Si bearings allow you to easily replace the main micro bearing by removing the built-in stopper ring from the outer housing. Its structure offers excellent maintainability, making it a highly cost-effective bearing.
Replacement micro ceramic bearings and stopper rings are also available for purchase separately.



Replacement Micro Ceramic Bearing HS-630AIR



Dedicated Stopper Ring 6mm





| Compatible Models

(Ambassadeur 4000C, 5000C, 6000C class)
*Old models

- 4500C
- 4600C
- 4600CA
- 4600FL
- 5000C
- 5500C
- 5500CA
- 5500GR
- 5600C
- 5600CA
- 5600FL
- 6000C
- 6500C
- 6500CA
- 6500GR
- 6600C
- 6600FL
- SM3600C
- PRO MAX 3600, etc.

*For reissued models, combinations of [1040 & 1040] bearings are common.

*Please note that the structure may vary slightly depending on the manufacturing year. Ensure that the bearing size matches your reel. In case of size mismatch, we offer free exchanges.



For Ambassadeur 4000, 5000, 6000 series reels where the spool shaft cannot be removed from the spool, the 1030AIR HD bearing size is often compatible.

Conversely, for Ambassadeur 4000, 5000, 6000 series reels where the spool shaft can be removed from the spool, the 1040AIR HD bearing size is frequently compatible.
→https://www.hedgehog-studio.co.jp/product/2573