What is the purpose of the .150 inch offset on this sprocket?

The .150 inch offset is a specific measurement designed to ensure proper alignment of the sprocket with your drive chain and wheel. This precise alignment is critical for smooth operation and to prevent premature wear on your drivetrain components.

How does the 51-tooth count affect my motorcycle's performance?

A 51-tooth count typically results in a lower final drive ratio compared to stock. This can lead to improved acceleration off the line, but may also reduce your top-end speed. The exact effect depends on your specific motorcycle's engine and gearing.

Does this sprocket come with any hardware for installation?

This product listing is for the rear sprocket only. Installation hardware, such as nuts and washers, is not included and should be sourced separately if needed.

Twin Power 73-85 FL FX 79-81 XL Zinc Disc Brake Rear Sprocket 51 Teeth Rpls H-D 41470-78 .150 Offset

Specifications

Brand: TwinPower
Part #: 492439
UPC: 887337165615

Twin Power 73-85 FL FX 79-81 XL Zinc Disc Brake Rear Sprocket 51 Teeth Rpls H-D 41470-78 .150 Offset

Name: Twin Power 73-85 FL FX 79-81 XL Zinc Disc Brake Rear Sprocket 51 Teeth Rpls H-D 41470-78 .150 Offset
Brand: TwinPower
Price: 71.67 USD
Availability: InStock

$71.67

On Backorder — Expected to ship by May 31, 2026

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Twin Power 51-tooth zinc rear sprocket with .150 offset. Replaces H-D 41470-78 and fits many Harley-Davidson FL and FX models.

Key Features

Fits Harley-Davidson FLH Electra Glide, FLHS Electra Glide Sport, FLHTC Electra Glide Classic, FLT Tour Glide, FX Super Glide, FXB Sturgis, FXDG Disc Glide, FXE Super Glide, FXEF Fat Bob, FXR Super Glide II, FXRC Low Rider Chrome, FXRDG Disc Glide, FXRS Low Glide, FXRT Sport Glide, FXS Low Rider, FXSB Low Rider - Belt, FXST Softail Standard, FXWG Wide Glide, XLCH, and XLS Roadster models.
Replaces Harley-Davidson part number 41470-78.
Features a 51-tooth count for your final drive ratio.
Includes a .150 inch offset for proper chain alignment.
Zinc-plated finish helps protect against corrosion.

Secure CheckoutFast Shipping631-982-0042

Will this fit your vehicle?

Product Details

This is a Twin Power 51-tooth rear sprocket designed for disc brake applications, featuring a zinc-plated finish and a .150 inch offset. It's built to replace Harley-Davidson part number 41470-78, offering a direct fit for a wide range of Harley-Davidson FL and FX models from the mid-70s through the mid-80s, including popular bikes like the Electra Glide, Super Glide, and Softail Standard.

The zinc plating on this sprocket helps resist corrosion, keeping it looking good and functioning well over time. With 51 teeth, it's intended to alter your final drive ratio, which can affect acceleration and top-end speed depending on your riding style and engine setup. The .150 inch offset is a specific measurement that ensures proper alignment with your drive chain and wheel, which is crucial for smooth operation and preventing premature wear on your drivetrain components.

When you're rebuilding your drivetrain or just looking to replace a worn-out sprocket, this Twin Power unit offers a well-built O.E.M. replacement option. Make sure to check your specific model's fitment to confirm it's the right choice for your Harley-Davidson.