Harddrive 21T 0.500" Offset Transmission Sprocket - Harley Big Twin 5-Speed
About Harddrive
Harddrive is the house performance and replacement line built for American V-twins, covering everything from engine hardware and electrical to controls, lighting and chassis parts. The range is aimed squarely at Harley-Davidson and Indian riders who want a direct-fit part without dealer pricing, and it spans decades of model years — from Evolution-era Softails to current Milwaukee-Eight baggers.
Equip your older Big Twin with the Harddrive 21-tooth offset transmission sprocket, designed for 5-speed models. This precision-machined component provides crucial clearance for wider rear tires and ensures durable performance.
Why riders pick this
- 21-tooth count for Big Twin 5-speed
- Hardened steel teeth for superior durability
- 0.500" offset for wider rear tire clearance
- Direct OEM replacement for easy installation
- Ideal for custom V-twin applications
For riders running a Harley Big Twin with a 5-speed transmission, the Harddrive 21-tooth offset transmission sprocket is a vital upgrade when fitting wider rubber. Crafted with precision-machined hardened steel teeth, this sprocket delivers exceptional durability and reliable power transfer. The integrated 0.500" offset provides critical clearance, allowing you to fit a wider tire without the need for extensive primary or transmission modifications.
Engineered for Big Twin 5-Speed and Wider Tires
- 21-tooth count for Harley Big Twin 5-speed transmissions
- Precision-machined hardened steel teeth for superior longevity and wear resistance
- 0.500" offset design provides crucial clearance for wider rear tires
- Direct OEM replacement specification ensures a straightforward installation
Upgrading Your Classic Big Twin
This Harddrive offset sprocket is a key component for any Big Twin 5-speed owner looking to modernize their bike's appearance and accommodate wider tires. Its robust construction ensures dependable power transfer, while the integrated offset simplifies the process of fitting wider tires on your Touring, Softail, or Dyna platform. Consider pairing it with a new chain and fresh primary components to ensure your entire drivetrain is ready for the road ahead.
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)
Common questions
Will this sprocket fit my Harley-Davidson Big Twin?
This 21-tooth offset transmission sprocket is specifically engineered for Harley-Davidson Big Twin models equipped with a 5-speed transmission, from 1994 to 2006. It will not fit 6-speed models.
What does the 1/2-inch offset mean?
The 1/2-inch offset moves the sprocket slightly away from the transmission case, creating additional space to allow for the installation of a wider rear tire without modifying the primary or transmission.
Is this a durable replacement part?
Yes, Harddrive manufactures this sprocket from hardened steel with precision-machined teeth, designed for extended wear and reliable performance as an OEM replacement.
Ordering from Vtwinbikers
- Brand new, sourced through authorized US distribution — never used, never grey-market.
- Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
- Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
| BRAND | Harddrive |
| TYPE | Sprockets |
| SKU | 820-54700 |
| WEIGHT | 1.66 lb |
