Bearing ENDURO 61805 LLU/LLB A5 25x37x7 ABEC-5, CN

Bearing ENDURO 61805 LLU/LLB A5 25x37x7 ABEC-5, CN

The ENDURO 61805 LLU/LLB A5 is an ABEC-5 rated radial bearing designed specifically for bicycle bottom bracket applications. It features raceways made from 52100 high-carbon chromium steel, paired with Grade 5 precision balls, delivering exceptionally smooth operation and long service life under high loads.

This bearing is filled with 90% high-pressure waterproof grease, providing excellent protection against moisture and contamination while minimizing wear. Its deep-groove race design allows for larger balls, increasing load capacity and overall durability.

The LLU/LLB seal configuration is optimized for cycling use. A gray full-contact LLU seal on the outside faces the elements to reduce water and dirt ingress, while the low-friction black LLB seal on the inside keeps the grease securely inside the bearing.

The most common application for this bearing is as a direct replacement bearing for Shimano external cup bottom brackets when using the Shimano plastic bearing insert. If you prefer to avoid the plastic insert, the MR 2437 bearing is the correct alternative.

The CN clearance specification makes this bearing ideal for looser press-fit bearing bores. Like all ENDURO bearings, it is engineered with the deepest possible race grooves and dual-lip labyrinth seals riding in a micro-groove, ensuring long service life and superior protection against the elements.

Technical specifications:

• Type: Radial bearing (bottom bracket)
• Dimensions: 25 × 37 × 7 mm
• ABEC rating: ABEC-5
• Clearance: CN
• Seals: LLU (outer) / LLB (inner)
• Balls: Grade 5
• Grease: high-pressure waterproof grease (90% fill)
• Material: 52100 high-carbon chromium steel
• Application: Shimano external cup bottom brackets