Description
Brand New Old Stock (NOS) PBI U.S.A. Final Drive Chain Conversion Sprocket Set — Includes 25T Front Countershaft & 50T Rear Aluminum Sprockets.
- Front Sprocket Part #: 277-25 C/S (25-Tooth Steel)
- Rear Sprocket Part #: 2072-50 REAR (50-Tooth Aluminum)
- Rear Hub Register ID: 2.216" Bore
- Drive Specification: Engineered for standard 530 Series final drive chains (Chain NOT included)
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Country of Manufacture: United States
Up for sale is a brand new, new-old-stock PBI Sprockets Matched Front and Rear Chain Conversion Gear Set. Distributed through high-performance track programs like Zipper's Performance Products, this set allows you to convert a stock rubber final drive belt setup over to a high-torque chain drive configuration.
The 25T front sprocket is CNC-machined from high-tensile US steel alloy and heat-treated for maximum wear resistance on the transmission main splines. The 50T rear sprocket is carved from premium aerospace-grade 7075-T6 aluminum, giving you immense structural integrity while significantly slashing unsprung rotational mass compared to heavy factory steel gears or bulky belt pulleys.
This 25/50 gearing combo is highly popular for stunting, drag racing, aggressive canyon carving, or building period-correct custom choppers where absolute reliability under hard acceleration is mandatory.
🏍️ Fitment & Vehicle Compatibility:
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Primary Application: Standard 5-speed transmission countershaft splines and 5-bolt rear wheels featuring the standard 2.216" center register pilot diameter.
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Target Models: Fits 2000 to 2005 Harley-Davidson Sportster XL883 and XL1200 models (including Custom, Hugger, Roadster, and Sport models) running an aftermarket chain swap framework.
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Note: The rear 50T sprocket will mechanically bolt onto Sportster wheel hubs spanning all the way up to 2022, but always cross-reference your specific front output shaft spline offset profile if upgrading late fuel-injected configurations.
📦 Condition Notes:
Both components are genuine New Old Stock (NOS) and are 100% brand new, clean, and uninstalled.
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The Front Sprocket remains pristine inside its original retail distributor box labeled by Zipper's Performance. The cardboard box shows normal light shelf crinkling and age storage wear.
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The Rear Sprocket is still factory vacuum-sealed in its original defensive shrink-wrap layout on the graphic PBI display card backing. The plastic wrap has typical outer warehouse scuffs, but the aluminum teeth are fully protected and immaculate.
Please Note: This listing is for the front and rear sprockets ONLY as pictured. A drive chain, mounting bolts, and master link are NOT included.
