Product Description

SHIMANO 105BR BALL BEARING (BNT4945)

Precision Support for X-Ship Performance

The Shimano 105BR Ball Bearing (BNT4945) is a high-grade, genuine OEM stainless steel bearing found in the drive train of Shimano’s premium low-profile baitcasting reels. Measuring 5x9x3mm, this bearing is most frequently utilized as the Pinion Gear Support Bearing (often located under the Cast Control Cap) or the Drive Shaft Bearing (at the base of the handle shaft) in reels featuring X-Ship technology.

Because it supports critical rotating gears under load, this bearing is vital for maintaining gear alignment and cranking smoothness. If your reel feels "geary" or makes a whirring noise when casting or retrieving, replacing this bearing often resolves the issue and restores the "free-floating" feel of the pinion gear.

Product Specifications

• Part Name: Ball Bearing (S A-RB / Shielded Anti-Rust)

• Manufacturer: Shimano

• Part Number (MPN): BNT4945

• Schematic Code: 105BR (Location code in many diagrams)

• Dimensions: 5mm (ID) x 9mm (OD) x 3mm (Width)

• Material: S A-RB Stainless Steel (Corrosion Resistant)

• Installation Position: Pinion Gear Support or Drive Shaft Base (varies by model)

Compatible Models

This bearing is standard equipment in high-performance Shimano baitcasters produced from approximately 2013 to the present.

• Shimano Metanium Series:

  • 13 Metanium HG / XG

  • 16 Metanium MGL (Normal, HG, XG)

  • 20 Metanium MGL

• Shimano Bantam Series:

  • 18 Bantam MGL (PG, HG, XG)

• Shimano An