Product Description

SHIMANO 105GW IDLE GEAR (B) (BNT1301)

Drive Your Level Wind System

The Shimano 105GW Idle Gear (B) (Part No. BNT1301) is a genuine OEM white plastic gear found in the level wind drive train of classic Shimano baitcasting reels. This gear serves as the intermediate connection between the drive shaft gear and the worm shaft gear. It transfers the rotation of the handle to the worm shaft, causing the line guide to move back and forth.

If your level wind has stopped moving but the handle still turns, or if you hear a "clicking" sound coming from the non-handle side, this gear is often the culprit. As a "sacrificial" part designed to fail before more expensive metal gears, its teeth can strip under heavy load or if debris enters the worm shaft. Replacing it is a standard repair to restore line lay function.

Product Specifications

• Part Name: Idle Gear (B)

• Manufacturer: Shimano

• Part Number (MPN): BNT1301

• Schematic Code: 105GW

• Material: White Nylon / Plastic

• Installation Position: Non-Handle Side (Inside the Frame, connecting Drive Shaft to Worm Shaft)

Compatible Models

This part is the standard idle gear for the legendary "Green" Curado B series and related reels from that era (late 1990s - mid 2000s).

• Shimano Curado B Series:

  • CU 200 B (Green)

  • CU 201 B (Left Hand)

  • CU 200 B5 (5:1 Ratio)

  • CU 200 BSF (Super Free)

• Shimano Castaic Series:

  • CA 200 SF, CA 201 SF

• Shimano Citica Series:

  • CI 200, CI 200 B

• Shimano Chronarch Series:

  • CH 100 SF (Check schematic; some use different sizing)

Installation & Reference

To ensure this is the correct gear for your reel, please cross-reference the part number BNT1301 or the schematic code 105GW with your reel's service diagram.

• Schematic Diagrams: For detailed PDF schematics and part location verification, please visit www.reelschematic.com.

• Alternate Part Number: BNT1301

Installation Tip: This gear spins on a small post and is typically held in place by a washer and an E-Clip (often BNT0032). When installing, ensure the area is clean of broken plastic teeth from the old gear. Apply a light coating of reel grease (like Shimano Permalub) to the teeth, but do not over-grease, as this can trap dirt.