Harddrive Transmission Sprocket - 21t BIG Twin 5 Speed 1994-2006 .500 — Harley-Davidson (1994-2006)

Harddrive 21-tooth transmission sprocket for Big Twin 5-speed models 1994-2006, precision-machined with hardened teeth for extended wear. Direct OEM replacement available in 1/2-inch offset for accommodating wider tires without primary or transmission modifications.

Features

• 21-tooth count for Big Twin 5-speed
• Precision-machined hardened steel teeth
• 1/2-inch offset design
• OEM replacement spec

Specifications

• Brand: Harddrive
• Manufacturer Part #: 191331
• UPC: 191361169380
• Tooth Count: 21
• Offset: 1/2 inch
• Length: 5.25 in
• Width: 5.25 in
• Height: 1.4 in
• Weight: 1.66 lbs
• Country of Origin: China (Taiwan)

Fitment

Fits Harley-Davidson Big Twin 5-speed transmission 1994-2006.

Frequently Asked Questions

Will this fit my Big Twin 6-speed?

No — this sprocket is engineered for 5-speed transmissions only. 2007+ Big Twins with 6-speed boxes require a different part number.

What does 1/2-inch offset mean?

The offset allows you to fit a slightly wider rear tire without offsetting the primary or transmission case — ideal for custom tire upgrades.

How long do these teeth last?

Harddrive uses hardened steel and precision machining for extended wear. Lifespan depends on riding style and maintenance; expect 15,000-30,000+ miles under normal conditions.

Is this a direct bolt-in replacement?

Yes — bolt straight into your stock transmission basket. No modifications needed.