Harddrive 1-1/8" 135-Tooth 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.
This Harddrive 1-1/8" rear belt with a 135-tooth profile is built with a carbon fiber reinforced tension member, designed for strength, low noise, and temperature stability across extreme riding conditions. It's a direct OE replacement for specific Harley-Davidson Softail models.
Why riders pick this
- Carbon fiber reinforced for superior strength
- Treated tooth-facing resists punctures and debris
- Synthetic rubber for low noise and temperature stability
- Increased flexibility and width stability
- Made in the USA for V-twin drivetrains
When you're chasing usable torque and a reliable ride, every component in your drivetrain matters. The Harddrive 1-1/8" 135-tooth rear belt is engineered for the demands of Harley-Davidson Softail models, featuring a carbon fiber reinforced tension member that delivers higher strength and durability than aramid alternatives. This belt ensures efficient power delivery with reduced noise, providing a smoother and more dependable ride.
Advanced Construction for Reliable Performance
- Carbon fiber tension member provides superior strength over aramid belts
- Treated tooth-facing fabric resists punctures and debris, extending belt life
- Synthetic rubber teeth rated for extreme temperatures, -30°C to +130°C
- Synthetic rubber backing increases flexibility and maintains width stability
Precision Fit for Harley-Davidson Softail
This Harddrive rear belt is designed as a precise replacement for Harley-Davidson Softail models requiring a 1-1/8" wide, 135-tooth belt. It specifically matches OE# 40307-00, ensuring a straightforward installation and optimal performance. Always confirm the OE number and tooth count from your bike's original belt to guarantee perfect fitment before ordering.
Specifications
- Brand: Harddrive
- Manufacturer Part #: 21192454
- OE Number: 40307-00
- Tooth Count: 135T
- Width: 1-1/8 in
- Length: 14 in
- Weight: 3 lbs
- UPC: 191361537639
- Country of Origin: USA
Common questions
How do I confirm this belt fits my Harley Softail?
Check your original belt for the OE# 40307-00. If it matches, this Harddrive belt is a direct replacement. You can also confirm the 1-1/8" width and 135-tooth count with your service manual or our Shop by Bike tool.
What are the benefits of a carbon fiber reinforced belt?
Carbon fiber provides higher structural strength and durability compared to traditional aramid-reinforced belts, leading to a longer lifespan, improved power transfer, and better resistance to wear and tear.
Will this belt perform well in different weather conditions?
Yes, the synthetic rubber teeth are rated for a wide temperature range, from -30°C to +130°C, ensuring consistent and reliable performance in various climates.
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 | 820-60011 |
| WEIGHT | 3.0 lb |
