Product Description
Shimano 10CQT Idle Gear B (Large) (RD17293)
The Shimano 10CQT Idle Gear B (Large) is a critical internal component of the oscillation system in Shimano spinning reels. It acts as an intermediary gear that transfers rotational energy from the pinion gear or main gear to the oscillation gear, which in turn moves the spool up and down to ensure perfect line lay.
Because the oscillation system is under constant motion during the retrieve, the teeth on the idle gear can eventually wear down, especially if the reel is used under heavy load or if internal lubrication has dried out. A worn idle gear often results in a "clunky" or uneven spool movement. Replacing it with this genuine Shimano factory part ensures the smooth, rhythmic oscillation required to prevent line tangles and wind knots.
Product Specifications
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Part Name: Idle Gear B (Large)
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Part Number: 10CQT
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Shimano Code: RD17293
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Material: High-Impact Industrial Polymer
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Function: Transfers rotational force within the spool oscillation assembly.
Alternate Part Numbers
This part is identified in various regional technical catalogs and service manuals by the following number:
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RD17293
Compatibility & Fitment
The 10CQT (RD17293) is a specialized component used in several of Shimano's mid-to-high-tier spinning reel series. It is a direct factory fit for the following models:
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Shimano Stradic Series: ST-2500HGFL, ST-C3000HGFL, ST-4000FL, ST-C5000XGFL
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Shimano Vanford Series: VF-2500HG, VF-C3000HG, VF-4000, VF-C5000XG
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Shimano Sustain Series: SA-2500HGXG, SA-C3000HG, SA-4000, SA-C5000XG (FJ Models)
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Shimano Ultegra Series: UL-2500HG, UL-C3000HG, UL-4000XG, UL-C5000XG (FC Models)
Pro Tip: When replacing Idle Gear B, always inspect Idle Gear A and the Oscillation Gear for matching wear patterns. Replacing gears in sets often results in a much smoother "out-of-the-box" feel. For a precise view of how these gears mesh within the body of your reel, consult the PDF schematics at www.reelschematic.com.
Key Features
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Smooth Oscillation: Precision-cut teeth ensure a silent and vibration-free spool stroke.
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Low Friction: The polymer construction is designed to operate with minimal resistance when properly greased.
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Perfect Line Lay: Restores the exact timing of the spool movement, which is essential for long-distance casting and preventing line "dig-in."
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Direct OEM Fit: Guaranteed to seat perfectly on the internal frame pins without the need for shimming or modification.
