Harddrive O2 Sensor Adapter - 18mm to 12mm Reducer - Harley Touring & 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.
The Harddrive O2 sensor adapter is an essential component for riders upgrading their exhaust system or mixing exhaust generations on their V-twin. This adapter efficiently reduces an 18mm O2 sensor bung to a 12mm opening. It ensures your modern O2 sensors can be properly installed in performance exhausts that utilize a smaller bung size.
Why riders pick this
- Reduces 18mm O2 sensor bungs to 12mm
- Ensures compatibility with modern O2 sensors
- Ideal for performance exhaust upgrades
- Allows use of earlier exhausts on newer V-twins
- Direct bolt-in for easy installation
When you're chasing more power and better sound, an aftermarket exhaust is often the first stop. This Harddrive O2 sensor adapter bridges the gap between different exhaust and sensor sizes, making sure your engine management system gets accurate readings. It's especially useful for Harley Touring and Softail owners looking to install performance exhausts or adapt older exhaust systems with larger bungs to newer bikes that use smaller O2 sensors.
Seamless Exhaust System Integration
- Reduces 18mm O2 sensor bungs to 12mm for wider compatibility
- Enables fitment of modern O2 sensors into performance exhaust systems
- Facilitates pairing of earlier exhaust designs with later model V-twin motorcycles
- Direct bolt-in design for straightforward installation
Optimized Performance and Upgrade Path
Accurate O2 sensor readings are critical for your bike's fuel mapping and overall performance. This adapter ensures your engine runs optimally with your chosen exhaust setup, preventing error codes and maintaining efficiency. It's a small but vital piece of hardware that unlocks a broader range of exhaust upgrade possibilities for your Harley-Davidson or Indian Motorcycle.
Specifications
- Brand: Harddrive
- Manufacturer Part #: 52-830
- UPC: 191361115363
- Length: 6.29 in
- Width: 3.74 in
- Height: 0.78 in
- Weight: 0.022 lbs
- Country of Origin: China (Taiwan)
Common questions
What O2 sensor bung sizes does this adapter work with?
This adapter is designed to fit an 18mm O2 sensor bung and reduce it to a 12mm opening, accommodating modern O2 sensors in various exhaust systems.
Can I use this adapter to install an older exhaust on a newer Harley-Davidson?
Yes, this adapter is perfect for that scenario. If you have an older exhaust with an 18mm bung and want to use it on a newer V-twin that requires 12mm O2 sensors, this adapter provides the necessary conversion.
Is this a bolt-on part or does it require modification?
The Harddrive O2 sensor adapter is designed for direct bolt-in installation, making it a straightforward addition to your exhaust system without requiring extensive modifications.
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 | Electrical |
| SKU | 820-0082 |
| WEIGHT | 0.02 lb |
