F-F RACING KTM-DUKE-390-DRAG Swingarm Extension Race Kit Duke In
fits make: Ktm. year: 2015–2023.
( Brand: F-f Racing ), ( Manufacturer Part Number: KTM-DUKE-390-DRAG ), ( Frame Type: Custom Fit ), ( Rear Sprocket: 1210-1709 45 Tooth ), ( Front Sprocket: 1212-1571 14 Tooth ), ( Color: Black ), ( Material: Aluminum ), ( Placement On Vehicle: Rear ), ( Type: Frame ), ( Ek Zvx3 520 X 150 Chrome Chain: 1223-0677 520 Chrome Zvx3 ), ( Manufacturer Warranty: Lifetime ), ( Oe/oem Part Number: Ktm-duke-390-be-bl ), ( Frame Style: Bolt On Swingarm Extensions ), ( Unit Quantity: Pair ), ( Finish: Cnc-machined ), ( Country Of Origin: United States ), ( Item Weight: 6lb )
Review F RACING Ktm Duke Swingarm Extension Drag Race Kit Inch Made In The Usa fits 390 2015–2023
The **KTM Duke 390 Drag 2015 2023 Swingarm Extension Race Kit** is a meticulously engineered aftermarket upgrade designed to transform the handling dynamics of your KTM 390 Duke into a high-performance, trail-ready machine tailored for aggressive riding, racing, or extreme off-road applications. Built to enhance stability, traction, and maneuverability, this precision-crafted kit replaces the stock swingarm with a reinforced, extended version that lowers the rear suspension and shifts the bike s center of gravity lower to the ground. The extended swingarm increases the wheelbase slightly, which improves stability at high speeds while also allowing for a more aggressive, aggressive riding stance ideal for drag racing, track days, or technical trail riding where precise control is paramount. Constructed from high-grade, heat-treated steel, the swingarm features a robust design with reinforced mounting points to handle the increased stress of racing conditions, ensuring durability under extreme loads. The kit includes all necessary hardware, including new rear axle spacers, extended rear shock mounts, and precise alignment tools to guarantee a seamless installation process. Whether you re pushing the limits on a racetrack, conquering rough terrain, or simply seeking a more responsive ride, this swingarm extension kit delivers the performance edge you need to dominate your riding environment. Perfect for both stock and modified Duke 390 setups, it s a must-have for riders who demand more from their machine.
### Pros and Cons of Buying a KTM Duke 390 Race Kit (2015 2023) with Swingarm Extension
#### **Pros:**1. **Improved Handling and Stability**
The swingarm extension kit lowers the rear suspension and shifts the bike s center of gravity lower, which enhances stability and reduces the tendency to squat under acceleration. This is particularly beneficial for aggressive riding, track use, or high-speed stability.
2. **Better Weight Distribution**
By extending the swingarm, the rear end of the bike becomes more balanced, reducing the "nose-heavy" feel that some riders experience on stock Duke 390s. This can lead to more predictable cornering and less oversteer.
3. **Enhanced Agility and Responsiveness**
The lowered rear end improves the bike s agility, making it more nimble in tight corners and allowing for quicker weight shifts. This is especially useful for track days or street riding where precise control is desired.
4. **Compatibility with Other Race Mods**
The Duke 390 is a popular platform for track modifications, and the swingarm extension works well with other race kits (e.g., exhaust, ECU tuning, suspension upgrades). This makes it easier to build a fully customized track bike.
5. **Aesthetic Appeal**
The extended swingarm gives the Duke a more aggressive, sportier look, which appeals to riders who want a bike that stands out from the stock version.
6. **Potential for Increased Power Delivery**
While the swingarm extension itself doesn t add power, it pairs well with performance upgrades (e.g., high-flow exhaust, remapped ECU) that can improve throttle response and top-end speed.
7. **Track Legality (In Some Cases)**
Depending on the racing series or track rules, some versions of the Duke 390 with race kits (including swingarm extensions) may be allowed in amateur or club racing, though full homologation may still require additional modifications.
---
#### **Cons:**1. **Cost of Installation and Additional Mods**
The swingarm extension kit is not cheap, and installing it often requires professional help (e.g., welding, alignment, or suspension tuning). Additionally, you may need to upgrade other components (e.g., rear shock, chain, sprocket) to ensure compatibility and performance.
2. **Potential for Overmodding**
The Duke 390 is already a lightweight, nimble bike. Extending the swingarm too aggressively without proper suspension tuning can lead to an overly twitchy or unstable ride, especially for inexperienced riders.
3. **Rear Tire Wear and Handling Trade-offs**
The lowered rear end can increase rear tire wear due to higher stress on the contact patch. Additionally, some riders report that the bike becomes less forgiving on rough roads or in emergency maneuvers.
4. **Limited Off-Track Practicality**
While the Duke 390 is already a versatile street bike, the race kit version may feel less comfortable for daily commuting or highway cruising. The lower rear end can make it harder to mount/dismount, and the aggressive setup may not suit all riding styles.
5. **Warranty Voiding**
Installing aftermarket parts like a swingarm extension typically voids the manufacturer s warranty. This means any future issues with the frame or suspension may not be covered.
6. **Compatibility Issues with Stock Components**
The extended swingarm may not work well with stock rear suspension or shock setups. You may need to upgrade to a performance shock (e.g., hlins, WP XACT) or adjust preload settings, adding to the cost.
7. **Legal Restrictions in Some Regions**
Depending on local laws, aftermarket swingarm extensions may not be street-legal without additional modifications (e.g., homologation plates, custom plates). Always check regional regulations before purchasing.
8. **Learning Curve for New Riders**
The Duke 390 is already a bike that rewards skillful riding. The race kit version demands more confidence and precision, which can be intimidating for beginners or riders transitioning from larger, heavier bikes.
---
### **Conclusion:**The **KTM Duke 390 Race Kit with swingarm extension (2015 2023)** is an excellent choice for riders who prioritize **track performance, handling precision, and an aggressive riding experience**. It transforms the Duke into a more balanced, responsive, and stable bike, making it ideal for track days, club racing, or aggressive street riding. However, it is **not a plug-and-play upgrade** it requires careful planning, additional modifications, and a willingness to invest in a performance-oriented setup.
If you are an **experienced rider** looking to push the limits of the Duke 390 on a track or in high-speed riding scenarios, the race kit is a worthwhile investment. For **casual riders, beginners, or those who prioritize comfort and versatility**, the stock or lightly modified Duke may be a better fit.
---
### **Recommendation:** - **Buy the Kit If:**- You are an experienced rider with track or aggressive street riding goals.
- You are willing to invest in complementary upgrades (suspension, exhaust, ECU tuning).
- You plan to use the bike primarily for performance riding rather than daily commuting.
- You have access to professional installation and alignment services.
- **Avoid the Kit If:**- You are a beginner or prefer a more forgiving, stock-like riding experience.
- You primarily ride on highways or rough roads where comfort is a priority.
- You are on a tight budget, as the total cost of modifications will likely exceed the bike s original value.
- You are unsure about your ability to handle a more aggressive, low-center-of-gravity bike.
**Final Verdict:** The KTM Duke 390 Race Kit with swingarm extension is a **highly effective performance upgrade** for the right rider, but it is not a simple or cheap modification. Weigh the benefits against your riding goals, budget, and experience level before committing. If you decide to proceed, pair it with other race-ready components (e.g., hlins shock, high-flow exhaust, ECU tune) for the best results.
Details:
Easy installation. 1 set of billet swingarm extensions. Comes with correct brake bar or plate. 55 brake line included.
EK ZVX3 520x 150 link Chrome #9400 tensile strength Chain, simply the best chain you can buy. Works with stock brake caliper bracket. 1 down 14 tooth steel front sprocket for better launch #1212-1571. Lifetime Warranty.
Made in the USA. Fast Shipping. Lower gearing for a better launch, You get.
specifications mocycfra:
- for makes: Ktm
- for years: 2015-2023
- brand: F-f Racing
- mpn: Ktm-duke-390-drag
- frame type: Custom Fit
- rear sprocket: 1210-1709 45 Tooth
- front sprocket: 1212-1571 14 Tooth
- color: Black
- material: Aluminum
- placement on vehicle: Rear
- type: Frame
- ek zvx3 520 x 150 chrome chain: 1223-0677 520 Chrome Zvx3
- manufacturer warranty: Lifetime
- oe/oem part number: Ktm-duke-390-be-bl
- frame style: Bolt On Swingarm Extensions
- unit quantity: Pair
- finish: Cnc-machined
- country of origin: United States
- item weight: 6lb
shipping mocycfra:
- type: Fixed
- cost: $20.00
- class: Expedited
- transit: 3-6 Days
- service: Expedited
general mocycfra:
- condition: New
- Motorcycle Scooter Parts Accessories > Body Frame > Frames Parts
returns mocycfra:
- time: 30 Days
- paid by: Seller
- policy: Returns Accepted
offer mocycfra:
- quantity: 5
- options: Ship-to-home
- sold: 0
- started: January 31, 2026
- availability: In Stock
payments mocycfra:
- credit card: Mastercard
- wallet: Apple-pay
- other
seller mocycfra:
- rating: 99.5%
- city: Gallatin, Tennessee
- # reviews: 630
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