Harddrive 20MM 133T Carbon Fiber Rear Belt - Harley Softail
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.
Replace your worn or stretched rear belt with this Harddrive 20MM 133T carbon fiber reinforced belt for Harley Softail models. Engineered for V-twin drivetrains, it delivers superior strength and quiet operation under load. This belt is designed to withstand extreme temperatures and resist road debris.
Why riders pick this
- Carbon fiber reinforcement for superior strength
- Resists punctures and road debris
- Synthetic rubber for quiet operation and temperature stability
- Increased flexibility and width stability
- Direct replacement for OEM part number 40073-07
This Harddrive 20MM rear belt is a direct replacement for Harley-Davidson Softail models, built to OEM specifications but with enhanced materials for better performance and durability. The carbon fiber tension member offers superior strength compared to aramid alternatives, ensuring your power gets to the ground efficiently and reliably. Riders looking to maintain their V-twin's performance will appreciate the quiet operation and resistance to temperature extremes.
Enhanced Durability and Performance
- Carbon fiber tension member provides superior strength and longevity
- Specially treated tooth facing resists punctures and road debris for extended life
- Synthetic rubber construction ensures low noise and temperature stability
- Synthetic rubber backing increases flexibility and maintains width stability
Ready for the Road Ahead
Whether you're cruising or pushing your Softail hard, this Harddrive rear belt is built to handle it. Its robust construction means less downtime and more miles on the road. For riders who demand reliability and performance from their drivetrain components, this belt is a solid upgrade that installs like a factory part.
Specifications
- Brand: Harddrive
- Manufacturer Part #: 21203000
- UPC: 191361537721
- Belt Size: 20MM, 133 tooth
- Length: 14 in
- Width: 14 in
- Height: 2 in
- Weight: 3 lbs
Common questions
Is this a direct replacement for my OEM belt?
Yes — this Harddrive belt matches OEM part number 40073-07 specifications and fits any V-twin that originally used that part. Please confirm your OEM part number before ordering.
What makes carbon fiber tension better than aramid?
Carbon fiber delivers higher structural strength and better fatigue resistance compared to aramid alternatives, leading to a more durable and reliable drive belt.
Will this belt change the performance of my Softail?
This belt is designed to meet or exceed OEM specifications, providing reliable power transfer and quiet operation. It will restore the intended performance of your drivetrain, especially if your old belt was worn.
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 | 820-60021 |
| WEIGHT | 3.0 lb |
