Looking for 39mm raked triple trees or compatible fork tube extensions to improve handling and front-end stance? This guide highlights five top Amazon picks that align with 39mm Harley-Davidson forks. Each choice targets different rider needs—stability, aggressive rake, or quick steering. Read on to see who benefits most and why these options were selected. The quick-reference table below helps compare core details at a glance.
| Product | Main Benefit | Best For | Limitations |
|---|---|---|---|
| Speed Merchant 39ST-1 39mm Speed Triple Tree | Black finish, direct 39mm fit | Vintage or retro builds seeking clean, streamlined look | Brand-specific fit may vary by model |
| 39mm Fork Tube 2″ Extension Kit Chrome | Adds 2″ of length for quicker steering | Harley Sportster and FXR models needing modest front-end raise | May not fit all 39mm forks or non-stock trees |
| 39mm Fork Tube 4″ Extension Kit Chrome | Longer extension for more aggressive rake | Choppers wanting a bold stance | Compatibility varies; verify fork and tree compatibility |
Note: All products listed are designed for 39mm Harley forks or compatible chassis. Choose according to how much front-end height you want, and ensure compatibility with your fork type and triple trees before purchasing.
Speed Merchant 39ST-1 39mm Speed Triple Tree
The Speed Merchant 39ST-1 provides a 39mm fit with a black finish for a clean, classic look. Best for riders seeking a straightforward upgrade to improve front-end feel on older and vintage-style builds. The design focuses on stable alignment with existing forks and stock trees. A caution is to verify fit with your specific 39mm fork and frame combination to avoid misalignment or interference with brake lines or front fenders.
39mm Fork Tube 2″ Extension Kit Chrome
Best for HarleySportster 883/1200 XL, FXR, and related models needing a modest rise. This kit extends the fork tubes by 2 inches, potentially reducing wheelbase feel and enabling quicker steering. It’s described as high-quality billet aluminum with a mirror-like finish. Best for riders wanting a concise, reliable raise without major geometry changes. A limitation is that it may not suit all model-year forks or non-standard triple trees. Always confirm compatibility with your bike’s front-end components before installation.
39mm Fork Tube 4″ Extension Kit Chrome
This 4″ extension kit is intended for riders seeking a dramatic front-end stance. It extends the fork tubes to raise the front end significantly, which can enhance rake and alter the ride geometry. Selecting this option is best for builds aiming for a bold profile or to compensate for a higher rear ride height. Caution: ensure the longer extension doesn’t cause contact with fenders, brakes, or wheel spokes on your specific bike. Verify the compatibility with your triple trees and springs.
XKMT- 39mm Fork Tube 5in Extensions
XKMT offers 5-inch fork tube extensions designed to raise and lengthen front ends while remaining compatible with stock triple trees and springs. Best for riders who want a substantial increase in rake and a noticeably longer front end. A potential limitation is fitment with certain forks or frame configurations; confirming model-year compatibility is advised before purchase.
39mm Fork Tube 5″ Extension Kit Chrome
This 5″ extension kit is designed for a pronounced front-end lift. It’s best suited for builds that aim to achieve an aggressive stance and improved wheel-fork alignment under a stretched frame. As with all long extensions, be mindful of possible steering changes and clearance to the front fairing, fender, and brake lines. Confirm that your triple trees and forks can accommodate the increased tube length.
Buying Guide
- Compatibility: Verify fork diameter (39mm) and whether your triple trees are stock or aftermarket. Confirm frame rake and wheelbase changes will not cause clearance issues.
- Extension Length: Shorter (2″) extensions offer modest steering feel changes; longer (4″–5″) extensions yield more dramatic rake and stance but can alter handling and clearance.
- Material and Finish: Billet aluminum with chrome or black finishes resists corrosion and adds style; ensure finish matches your bike’s aesthetics.
- Intended Ride Style: For retro or classic builds, a clean black triple tree may suit better; for choppers or custom builds, chrome extensions with pronounced rake can enhance look and stance.
- Installation Considerations: Some kits require additional hardware or may affect brake line routing and front fender clearance. Follow manufacturer guidance and seek professional installation if uncertain.
Frequently Asked Questions
- What does a 39mm fork tube extension do? It increases fork length to raise the front end, affecting rake and steering feel.
- Are 5″ extensions too long for street riding? They can be for some setups; ensure there is adequate clearance and no interference with the fender or brakes.
- Can I mix different brands for triple trees and extensions? Mixing components is possible but requires careful fitment checks to avoid misalignment.
- Do these extensions affect front braking? Yes, longer front ends can alter brake line routing; inspect and adjust as needed.
- Is professional installation recommended? If you are unsure about forks, trees, or alignment, professional installation is advised.