Harddrive 25-Tooth Standard Offset Transmission Sprocket - Harley & Indian V-Twin
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.
This Harddrive stainless steel transmission sprocket is purpose-built for V-twin motorcycles undergoing a belt-to-chain conversion. Featuring a 25-tooth count and standard offset, it's engineered to provide reliable performance and proper chain alignment. Crafted from CNC-machined carburized steel, it offers exceptional strength and wear resistance.
Why riders pick this
- CNC machined from carburized steel for high strength
- Hardened for maximum impact and wear resistance
- Optimal spline-to-shaft contact for secure mounting
- Black oxide finish for corrosion resistance and stealth look
- Designed for 530 chain conversion systems
- 25-tooth count for precise gear ratio tuning
Converting your Harley-Davidson or Indian Motorcycle to a chain drive demands components that can withstand the rigors of the road. This Harddrive 25-tooth transmission sprocket is a vital part of that upgrade, designed specifically for 530 chain systems. The black oxide finish not only enhances its appearance but also provides a durable, corrosion-resistant surface, ensuring longevity in varied riding conditions.
Built for Performance and Reliability
- CNC machined from carburized steel for superior strength
- Hardened for excellent impact and wear resistance
- Optimal spline-to-shaft contact geometry for a secure fit
- Black oxide finish provides enhanced corrosion protection
- Engineered for 530 chain conversion builds
Achieving Optimal Drivetrain Geometry
The 25-tooth count and standard offset of this Harddrive transmission sprocket are crucial for fine-tuning your V-twin's drivetrain. It helps achieve the desired gear ratio and ensures proper alignment between the transmission and rear sprockets, preventing premature chain wear. This sprocket is an essential component for riders seeking to maximize the performance and durability of their chain-driven setup.
Specifications
- Brand: Harddrive
- Manufacturer Part #: CST-2066_WPS:25.2
- UPC: 191361510908
- Teeth: 25
- Offset: Standard
- Material: Carburized steel
- Finish: Black oxide
- Weight: 1.5 lbs
- Country of Origin: Poland
Common questions
What is this sprocket's primary use?
This Harddrive 25-tooth transmission sprocket is designed for V-twin motorcycles converting from a belt drive to a 530 chain drive system. It's a key component for the front drive of your chain conversion.
How does the 25-tooth count impact my riding?
The 25-tooth count will affect your bike's final drive ratio, influencing characteristics like acceleration and cruising RPM. It's often chosen to balance performance needs during a chain conversion.
Is this a direct bolt-on replacement for a stock belt pulley?
No, this sprocket is for belt-to-chain conversion systems and is not a direct replacement for a stock belt pulley. It requires a 530 chain and a compatible rear sprocket.
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 | 820-51621 |
| WEIGHT | 1.5 lb |
