Quick Answer
For most Softail riders, the FOX GRIP Street Performance cartridge is the best value upgrade, but if you want on-the-fly adjustability and the highest performance, choose the Grip ST.
Why a Fork Cartridge Matters on a Softail
Softails use a conventional fork design that can dive under braking and wallow in corners. A cartridge kit replaces the internal damping rod with a sealed cartridge system, giving you more consistent damping and linear spring support.
The two FOX options for Softail differ in adjustability and price. Understanding those differences is the key to choosing the right one.
Adjustability vs. Value: The Main Trade-Off
The Grip ST is FOX's highest-end fork cartridge for V-Twins. It offers three-position compression and rebound adjustments on the top caps, so you can fine-tune the damping without tools. This is ideal if you ride varied terrain or want to dial in the feel precisely.
The GRIP Street Performance kit is more budget-friendly and still delivers a major improvement over stock. It uses linear rate springs and an opposed-piston design, but it lacks external adjusters. If you're happy with a set-it-and-forget-it setup, this saves you money.
Consider your riding style and how much you value adjustability before deciding.
Ride Height and Spring Weight Options
The Grip ST is available with different ride height and spring weight options, so you can tailor the fork to your bike and weight. The GRIP Street Performance kit does not list these options, which may limit fitment for some riders.
If you need a specific spring rate or ride height, the Grip ST gives you more flexibility. If the standard setup works for you, the GRIP Street Performance is simpler and cheaper.
Decision Rules: Choose Your Softail Fork Cartridge
- Do you want to adjust damping without tools?: If yes, choose the Grip ST. Its top-cap adjusters let you change compression and rebound in seconds, no tools needed. If you rarely change settings, the extra cost may not be worth it.
- Are you on a budget?: If you want a significant upgrade without the premium price, the GRIP Street Performance kit delivers linear spring support and consistent damping for less. You lose external adjustability, but the ride quality is still far better than stock.
- Do you need specific ride height or spring weight?: If yes, the Grip ST offers these options. If not, the GRIP Street Performance kit's standard setup may be sufficient. Check your bike's compatibility and your weight before ordering.
Product Facts
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Harley-Davidson Softail | 49mm GRIP ST Fork Cartridge: The Grip ST is a drop-in open bath cartridge kit with three-position compression and rebound adjustments on the top caps, adjustable without tools. You can fine-tune the fork feel on the fly, making it ideal for riders who want maximum adjustability.
Harley-Davidson Softail | 49mm GRIP ST Fork Cartridge
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Harley-Davidson Softail | Fork Cartridge: The GRIP Street Performance kit uses linear rate springs and an opposed-piston design to prevent air from mixing into the oil. This provides consistent damping and prevents dive and wallow, giving a solid upgrade at a lower price.
Harley-Davidson Softail | Fork Cartridge
Who Should Choose Which
Best for
- Riders who want maximum adjustability and are willing to pay for it
- Riders who need specific ride height or spring weight options
Not for
- Budget-conscious riders who don't need external adjusters
- Riders who prefer a simple, set-and-forget upgrade