Product Description
Shimano 10N9G Pinion Gear (B) (TT 0202) | Tiagra Two-Speed System
The Shimano 10N9G Pinion Gear (B) (TT 0202) is a precision-engineered internal component designed specifically for Shimano’s elite Tiagra series of offshore trolling reels. In a two-speed reel system, there are two sets of pinion and drive gears. The 10N9G represents the "B" gear in this transmission, typically responsible for the lower-speed, high-torque setting used to winch massive game fish like tuna and marlin from the depths.
Machined from high-strength, marine-grade stainless steel, this gear is built to handle the immense mechanical loads generated during deep-sea battles. The 10N9G is the updated global part number that has replaced the legacy TT 0202 specification.
Product Specifications
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Part Name: Pinion Gear (B)
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Shimano Part Number: 10N9G
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Legacy Part Number: TT 0202
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Material: Hardened Stainless Steel Alloy
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System: Two-Speed Transmission (Low Gear)
Compatible Reel Models
The 10N9G (TT 0202) is a specialized part for the larger frames in the Tiagra family. It is a direct fit for:
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Shimano Tiagra 50 (TI50)
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Shimano Tiagra 50W (TI50W)
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Shimano Tiagra 50A (TI50A)
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Shimano Tiagra 50WA (TI50WA)
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Shimano Tiagra 80W (TI80W)
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Shimano Tiagra 80WA (TI80WA)
Technical Tip: Replacing a pinion gear usually requires a matching Drive Gear (B) to ensure the teeth mesh perfectly. Mixing a new pinion with a worn drive gear can cause "gear howl" or premature wear. To verify the full gear set for your specific Tiagra model, consult the PDF schematics at www.reelschematic.com.
Maintenance & Lubrication Recommendation
Because the pinion gear is the primary point of force transfer between the handle and the spool, it is subject to extreme friction and heat. To protect these stainless steel teeth, we recommend Deuthlon Lubricants:
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For the Gear Teeth: Apply a generous coating of Deuthlon Reel Gear Grease. This high-tack, "EP" (Extreme Pressure) grease is formulated to stay on the teeth even under the crushing loads of a heavy drag setting, ensuring smooth, quiet operation.
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For the Pinion Shaft: Use a drop of Deuthlon Power Cast Oil on the internal surface where the pinion slides over the main shaft. This ensures the two-speed shifting mechanism remains crisp and doesn't "stick" when you need to switch gears mid-fight.
Why Choose Genuine Shimano 10N9G Parts?
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High-Torque Rating: Engineered with a specific tooth profile (modulus) to maximize surface contact and prevent gear stripping.
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Corrosion Immunity: The specialized stainless alloy is designed to resist the "pitting" that can occur when salt crystals are trapped in the gear teeth.
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Perfect Shifting: Machined to exact lengths to ensure the Shift Dog engages and disengages cleanly between high and low speeds.
