PBI Portco USA 25 Tooth Transmission Mainshaft Sprocket Harley 4 Speed Big Twin

Brand: PBI / Portco USA

Part Number (Ref): H-37-25 (Cross-references to PBI 279-25)

Tooth Count: 25-Tooth

Chain Size: Fits 530 Pitch Chain

Material: High-grade Chromoly Steel

Finish: Electroless Nickel Plating (for corrosion resistance)

Manufacturing: Made in the USA 

Model Compatibility

This sprocket is a direct fit for Harley-Davidson 4-Speed Big Twin transmissions, typically covering the following years and models:

Era Compatible Models

1936 – 1947 Knucklehead (EL, FL)

1937 – 1948 Big Twin Flathead (U, UL, ULH)

1948 – 1965 Panhead (FL, FLH)

1966 – 1979 Shovelhead (FL, FLH, FX, FXE, FXS)

Note: This 25-tooth configuration is often used to achieve higher top-end speeds and lower highway RPMs compared to the stock 22 or 23-tooth sprockets

selling as pictured.

more than welcome to pick up at shop in butler pa & save shipping.

031126hb