Harddrive 1-1/8" 128-Tooth Carbon Fiber Rear Belt - Harley Sportster
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 1-1/8" 128-tooth rear drive belt is engineered with carbon fiber reinforcement for V-twin motorcycle drivetrains. Its synthetic rubber construction delivers superior strength, low noise, and excellent temperature stability.
Why riders pick this
- Carbon fiber reinforced for increased strength
- Resistant to punctures and road debris
- Synthetic rubber for low noise and temperature stability
- Enhanced flexibility and width stability
- Made in the USA for V-twin drivetrains
When it comes to transferring power from your engine to the rear wheel, a robust drive belt is non-negotiable. The Harddrive 1-1/8" 128-tooth rear belt is built for the task, featuring a carbon fiber tension member that provides significantly increased strength and durability compared to aramid-reinforced belts. This design ensures reliable performance across a wide range of riding conditions, keeping your Harley moving forward with confidence.
Built for Demanding V-Twin Performance
- Carbon fiber tension member delivers higher strength than aramid alternatives
- Treated tooth-facing fabric resists punctures and debris for extended life
- Synthetic rubber teeth ensure quiet operation and temperature resistance
- Synthetic rubber backing enhances flexibility and maintains width stability
Reliable Upgrade for Harley-Davidson Sportster
Designed as a high-performance replacement, this Harddrive rear belt is suitable for Harley-Davidson Sportster models requiring a 1-1/8" wide, 128-tooth belt. Its construction makes it an excellent choice for riders who demand reliability and a long service life from their drivetrain components. Always verify the OE number and tooth count to ensure perfect fitment for your specific model.
Specifications
- Brand: Harddrive
- Manufacturer Part #: 21192451
- UPC: 191361537615
- Tooth Count: 128
- Length: 14 in
- Width: 14 in
- Height: 2 in
- Weight: 3 lbs
Common questions
How does carbon fiber reinforcement benefit my V-twin?
The carbon fiber tension member provides superior structural strength and durability compared to traditional aramid belts, leading to a longer lifespan and more reliable power transfer for your V-twin.
Is this belt a direct replacement for my Harley Sportster?
This belt is designed for Harley Sportster models that require a 1-1/8" wide, 128-tooth rear belt. It's crucial to verify your bike's original equipment part number, such as OE# 40022-91, and specifications using our Shop by Bike tool before purchasing.
Can this belt withstand extreme temperatures?
Yes, the synthetic rubber construction is rated for temperature stability from -30°C to +130°C, ensuring reliable performance in both cold and hot riding conditions.
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 | Belts |
| SKU | 820-60008 |
| WEIGHT | 3.0 lb |
