What does 'double undersized' mean for this pinion gear?

A double undersized gear is manufactured to be slightly smaller than the stock specification. This allows for finer adjustments to your motorcycle's gear ratio, which can affect acceleration and overall performance.

What is the primary benefit of changing the pinion gear?

Changing the pinion gear allows you to alter the gear ratio within your transmission. This can be done to improve acceleration off the line, increase top-end speed, or fine-tune the engine's powerband for specific riding conditions.

Does this pinion gear come with any installation hardware?

This product includes the 31-tooth double undersized pinion gear. Installation hardware, such as seals or gaskets, is typically sold separately and should be checked against your motorcycle's service manual.

S&S Cycle Pinion Gear 31 Tooth 33-4160XX

Name: S&S Cycle 1999+ BT 31 Tooth Double Undersized Pinion Gear
Brand: S&S Cycle
SKU: s-s-cycle-s-s-cycle-1999-bt-31-tooth-double-undersized-pinion-gear-t14-662814
Price: 132.95 USD
Availability: BackOrder

S&S Cycle 1999+ BT 31 Tooth Double Undersized Pinion Gear

$132.95

On Backorder

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

S&S Cycle 31 tooth double undersized pinion gear for 1999+ Harley-Davidson Big Twin models.

Key Features

Fits 1999 and later Harley-Davidson Big Twin models.
Features 31 teeth for specific gear ratio adjustments.
Double undersized design allows for precise drivetrain tuning.
Well-made component from S&S Cycle for reliable performance.
Designed as a direct replacement for compatible Harley-Davidson transmissions.

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Will this fit your vehicle?

Product Details

When you're rebuilding the drivetrain on your 1999 and later Harley-Davidson Big Twin, getting the right gear ratio is key for performance. This 31-tooth double undersized pinion gear from S&S Cycle is designed to help you achieve that specific setup. It's a well-made component that fits a wide range of Harley-Davidson models, including popular bikes like the Road King, Street Glide, and Fat Boy.

This gear is a double undersized pinion, meaning it's manufactured to a precise specification that's slightly smaller than stock. This allows for adjustments in your drivetrain's gear ratio, which can impact acceleration and top-end speed. S&S Cycle is known for their engine and drivetrain components, and this gear is built to their standards for reliable operation within your motorcycle's transmission.

If you're looking to fine-tune your motorcycle's power delivery or are in the process of a custom build, this pinion gear is a solid option. It's a direct replacement part for the specified Harley-Davidson models, making installation straightforward for those familiar with transmission work.