Choosing the right open primary belt drive kit for your Harley chopper involves balancing compatibility, durability, and ease of installation. For classic models from the 60s and 70s, the Primary Drive Belt BDL-138K offers a precise fit and high durability, making it an excellent choice for restoration or reliable daily riding. If you’re interested in high-speed performance and complete conversion options, the TOFR Chain Sprocket Conversion Kits provide robust, long-lasting components tailored for specific Harley models. Meanwhile, the 23 Tooth Belt-to-Chain Drive Conversion Front Sprocket suits those looking to customize gearing on FXR and Softail models. Each option has its tradeoffs—whether it’s installation complexity, compatibility, or specific riding needs—making it essential to match your motorcycle’s profile with the right kit.
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Key Takeaways
- The Primary Drive Belt BDL-138K is ideal for vintage Harley models needing a reliable, direct replacement belt.
- TOFR chain sprocket kits excel in high-speed riding and durability but might have limited model compatibility.
- The 23-tooth belt-to-chain sprocket offers gear customization but demands professional installation for best results.
- Complete conversion kits with tools tend to be easier for experienced riders but can be overkill for casual use.
- Compatibility varies significantly, so matching the kit to your Harley’s model year and type is critical.
| Primary Drive Belt BDL-138K 138 Tooth for Harley Davidson 1962-93 Dyna Low Rider Softail Fat Bob FL Super Glide |  | Best Overall Vintage Replacement | Tooth Count: 138 | Width: 8mm | Length: 41mm | VIEW ON AMAZON | See Our Full Breakdown |
| TOFR Chain Sprocket Conversion Kit for Harley Softail 2000-2006, 22 and 48 Tooth Sprockets |  | Best for High-Speed Softail Upgrades | Front Sprocket Material: 20CrMnTi steel, galvanized | Front Sprocket Teeth: 22 | Rear Sprocket Material: 55# steel, galvanized | VIEW ON AMAZON | See Our Full Breakdown |
| TOFR Chain Sprocket Conversion Kit for Harley Sportster 1991-up, 23+48 Tooth Sprockets |  | Best for Sportster High-Speed Upgrades | Front Sprocket Material: 20CrMnTi steel, galvanized | Front Sprocket Teeth: 23 | Rear Sprocket Material: 55# steel, galvanized | VIEW ON AMAZON | See Our Full Breakdown |
| 23 Tooth Belt-to-Chain Drive Conversion Front Sprocket for Harley FXR & Softail 1985-1999 |  | Best for Gear Ratio Customization | Tooth Count: 23 | Offset: ½” | Compatibility: 1985-1994 FXR, 1986-1999 Softail | VIEW ON AMAZON | See Our Full Breakdown |
| TOFR Chain Sprocket Conversion Kit for Harley Softail Dyna 2018-up, 2000-2006, 25 and 49 Tooth Sprockets |  | Best for Modern High-Speed Softail & Dyna | Front Sprocket Material: 20CrMnTi steel, galvanized | Front Sprocket Teeth: 25 | Rear Sprocket Material: 55# steel, galvanized | VIEW ON AMAZON | See Our Full Breakdown |
| open primary belt drive kit for harley chopper | Front Sprocket Material | Front Sprocket Teeth | Rear Sprocket Material | Rear Sprocket Teeth |
|---|---|---|---|---|
| Primary Drive Belt BDL-138K 13 | — | — | — | — |
| TOFR Chain Sprocket Conversion | 20CrMnTi steel, galvanized | 22 | 55# steel, galvanized | 48 |
| TOFR Chain Sprocket Conversion | 20CrMnTi steel, galvanized | 23 | 55# steel, galvanized | 48 |
| 23 Tooth Belt-to-Chain Drive C | — | — | — | — |
| TOFR Chain Sprocket Conversion | 20CrMnTi steel, galvanized | 25 | 55# steel, galvanized | 49 |
More Details on Our Top Picks
Primary Drive Belt BDL-138K 138 Tooth for Harley Davidson 1962-93 Dyna Low Rider Softail Fat Bob FL Super Glide
This belt is tailored for Harley models from the 60s to early 90s, making it ideal for vintage restorations. Its 138-tooth design ensures a perfect fit on classic models like Dyna and Softail lines. Compared with chain conversions, this belt offers quieter operation and less maintenance, but it lacks detailed installation instructions—potentially challenging for first-time installers. Its high-grade materials promise longevity, though the absence of compatibility info beyond mid-90s models limits its versatility.
Pros:- Precisely engineered for a perfect fit on classic models
- High-quality, durable materials extend lifespan
- Easy to replace as a direct belt substitute
Cons:- No installation instructions included
- Limited compatibility info beyond specific years
- Color may vary slightly from images
Best for: Owners of vintage Harley models seeking a reliable, direct belt replacement.
Not ideal for: Riders wanting a modern chain drive conversion or high-speed upgrade.
- Tooth Count:138
- Width:8mm
- Length:41mm
- Compatible Models:Harley Davidson 1962-93 Dyna, Low Rider, Softail, Fat Bob, FL, Super Glide
- Part Number:BDL-138K
Our verdict“A dependable, high-quality belt perfect for vintage Harley owners focused on authenticity and reliability.”
TOFR Chain Sprocket Conversion Kit for Harley Softail 2000-2006, 22 and 48 Tooth Sprockets
This complete kit is designed for Softail models from 2000 to 2006, emphasizing durability with galvanized steel sprockets and a heavy-duty chain. Its inclusion of installation tools makes it appealing for riders comfortable with DIY upgrades. The kit’s robust construction supports high-speed riding above 250 km/h, but its customer rating of 3.5 stars suggests inconsistent quality or fit issues. Compatibility beyond the specified models is limited, and the lack of explicit pricing may deter some buyers.
Pros:- Heavy-duty galvanized steel sprockets for longevity
- Complete set with installation tools included
- Designed for high-speed riding
Cons:- Customer ratings indicate possible quality concerns
- Limited model compatibility details
- No listed price
Best for: Experienced riders seeking high-performance chain conversions for Softail Harley models.
Not ideal for: Beginners or those with models outside the specified years.
- Front Sprocket Material:20CrMnTi steel, galvanized
- Front Sprocket Teeth:22
- Rear Sprocket Material:55# steel, galvanized
- Rear Sprocket Teeth:48
- Chain Material:45Mn alloy steel
- Chain Size:530/120
- Package Includes:1 front sprocket, 1 rear sprocket, sprocket spacer, chain, chain breaker tool
Our verdict“A solid choice for high-speed enthusiasts with compatible Softail models, despite some quality doubts.”
TOFR Chain Sprocket Conversion Kit for Harley Sportster 1991-up, 23+48 Tooth Sprockets
Designed for Sportster models from 1991 onward, this kit emphasizes durability and high-performance capabilities. The galvanized steel sprockets with 23 and 48 teeth support high-speed riding above 250 km/h, and the included tools make installation straightforward for experienced mechanics. However, reviews indicate some dissatisfaction with product quality, and compatibility with specific Harley models may require verification. Its price and warranty details are not explicitly listed, which might concern cautious buyers.
Pros:- Galvanized steel for durability
- Complete set with tools included
- Supports high-speed riding
Cons:- Mixed customer reviews on quality
- Limited model compatibility info
- No price or warranty details
Best for: Sportster owners seeking a robust chain conversion for high-speed riding.
Not ideal for: Casual riders or those with older Harley models outside the specified years.
- Front Sprocket Material:20CrMnTi steel, galvanized
- Front Sprocket Teeth:23
- Rear Sprocket Material:55# steel, galvanized
- Rear Sprocket Teeth:48
- Chain Material:45Mn alloy steel
- Chain Size:530/120
- Package Includes:Sprockets, chain, tools
Our verdict“A durable, high-performance option for Sportster owners but best approached with caution due to mixed reviews.”
23 Tooth Belt-to-Chain Drive Conversion Front Sprocket for Harley FXR & Softail 1985-1999
This sprocket enables conversion from belt to chain drive on Harley FXR and Softail models, offering gear ratio customization with its 23-tooth design. The .500 offset and included wheel spacer facilitate precise gear adjustments, making it a flexible upgrade for riders looking to fine-tune performance. However, installation demands careful setup and possible professional adjustment to achieve optimal results, and it is limited to specific model years.
Pros:- Allows precise gear ratio customization
- Includes necessary spacer for installation
- Compatible with multiple Harley models
Cons:- Requires careful installation
- May need professional adjustment
- Limited to specific model years
Best for: Harley owners wanting to modify gear ratios for performance tuning.
Not ideal for: Beginners or those seeking a direct, plug-and-play upgrade.
- Tooth Count:23
- Offset:½”
- Compatibility:1985-1994 FXR, 1986-1999 Softail
- Chain Type:530
- Includes:Wheel spacer
Our verdict“An excellent choice for experienced riders aiming to customize gearing on FXR and Softail models.”
TOFR Chain Sprocket Conversion Kit for Harley Softail Dyna 2018-up, 2000-2006, 25 and 49 Tooth Sprockets
This kit caters to newer Softail and Dyna models, providing galvanized steel sprockets with 25 and 49 teeth for high-speed riding. It includes all necessary components and tools, making it a comprehensive upgrade option. Its durability makes it suitable for aggressive riding, but it’s designed specifically for certain Harley models, which limits broader compatibility. Installation might require professional help, especially for those unfamiliar with chain drive conversions.
Pros:- Durable galvanized steel components
- Complete with tools for installation
- Optimized for high-speed riding
Cons:- Limited model compatibility
- May require professional installation
- No explicit warranty details
Best for: Owners of post-2018 Softail and Dyna models looking for a durable, high-speed upgrade.
Not ideal for: Vintage Harley owners or those outside the specified model years.
- Front Sprocket Material:20CrMnTi steel, galvanized
- Front Sprocket Teeth:25
- Rear Sprocket Material:55# steel, galvanized
- Rear Sprocket Teeth:49
- Chain Material:45Mn alloy steel
- Chain Size:530/120
- Package Includes:Sprockets, chain, tools
Our verdict“A high-quality, durable kit suited for modern Harley models targeting aggressive riding styles.”
How We Picked
Our selection process focused on compatibility with popular Harley chopper models, durability of materials, ease of installation, and overall value. We prioritized products that offer comprehensive kits with necessary tools, while also considering customer reviews regarding quality and fit. Each product was evaluated for its specific role—whether as a replacement belt, conversion sprocket, or gear ratio mod—and how well it suited different riding styles, from casual cruising to high-speed performance.
Factors to Consider When Choosing Open Primary Belt Drive Kit For Harley Choppers
Selecting the right open primary belt drive kit for your Harley chopper depends on several factors: the model year, your riding style, and whether you prefer a belt or chain system. The key is to match the kit’s compatibility, durability, and performance features with your motorcycle’s specific needs. For vintage restorations, a direct belt replacement like the BDL-138K offers simplicity and reliability, while high-speed riders may prefer the robust chain conversion kits for increased performance and customization. Understanding these distinctions will help ensure your upgrade aligns perfectly with your riding goals.Compatibility
Always verify that the kit is compatible with your Harley’s model year and type. Vintage models, such as 1962-93 Dyna and Softail, benefit from direct belt replacements, whereas newer models may require chain conversion kits to support performance enhancements or gearing adjustments.
Material and Durability
Look for galvanized or high-grade steel sprockets and durable chains if you plan on high-speed riding or long-term reliability. Cheaper materials may wear out faster or cause compatibility issues, especially under aggressive riding conditions.
Installation and Maintenance
Complete kits with tools simplify installation, but some may still require professional setup. Consider your mechanical skill level and whether the product includes instructions or support. Belt systems tend to be easier to maintain than chain conversions, which might need regular tension adjustments.
Performance Goals
If your focus is on restoring a vintage look, a belt replacement like the BDL-138K is ideal. For high-speed or gear ratio tuning, chain conversion kits like those from TOFR offer greater flexibility but at the cost of increased complexity.
Frequently Asked Questions
Can I use a chain sprocket kit on my vintage Harley?
Yes, but it depends on compatibility. Chain sprocket kits are generally designed for specific model years and types, such as Softail or Sportster from certain periods. Installing a chain on a vintage belt-driven Harley might require additional modifications, so verifying fitment and considering professional installation is advisable.
Are open primary belt drive kits easy to install myself?
The ease of installation varies. Direct belt replacements like the BDL-138K typically require basic mechanical skills and tools, making them suitable for DIYers. Conversely, chain conversion kits often involve more complex alignment and tensioning, which might be better handled by a professional to ensure safety and optimal performance.
What should I consider for high-speed riding upgrades?
For high-speed riding, durability and precise gear ratios are essential. Chain conversion kits from TOFR and similar brands are designed for such applications, offering galvanized steel sprockets and comprehensive tools. However, quality varies, so reviewing customer feedback and compatibility before purchase is wise.
Will switching from belt to chain affect my motorcycle’s handling?
Switching from a belt to a chain can alter your motorcycle’s handling slightly, primarily due to different tensioning and weight distribution. Chain drives tend to be heavier and may require adjustments to your suspension or frame alignment. Ensuring proper installation is key to maintaining ride quality.
Do these kits come with installation instructions?
Some kits, especially those from TOFR, include detailed tools and instructions, making DIY installation feasible. Others may lack comprehensive guidance, so professional installation might be necessary for proper fit and safety, particularly with complex chain conversions or gearing modifications.
Conclusion
For vintage Harley owners seeking a straightforward, reliable belt replacement, the Primary Drive Belt BDL-138K is the best choice. Riders focused on high-speed performance and customization should consider the TOFR chain sprocket kits, especially if they have experience with drivetrain modifications. Those looking to fine-tune gear ratios on FXR or Softail models will benefit from the 23 Tooth Belt-to-Chain Drive Conversion Front Sprocket. Ultimately, your choice hinges on your model year, riding style, and whether you prioritize ease of installation or performance upgrades.
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