Sirris F43 FORK FOR ZERO XE

F43 XE Trail Tune | LSC | 220 mm Travel | Zero XE

$2,250.00

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Description

Developed as a direct-fit upgrade by Sirris and tuned by Zero Motorcycles for the XE platform, this fork is built around wide-range trail valving, adjustable low-speed compression, adjustable rebound, and spring-preload tuning to match rider weight, terrain, and riding style.

Balanced with the XE chassis—not adapted from a generic race setup—it delivers the comfort, traction, and front-end confidence needed to elevate the bike’s trail capability.

RIDER WEIGHT SPECS:

Listed weight ranges are rider weight without riding gear on. 15 pounds of riding gear is calculated into the weight ranges

160 lbs - 180 lbs (Medium = 4.4/4.0 springs)
Fork spring rates listed above are left side/right side.

FORK SPECS:

Architecture
Upside down fork

Travel
220 mm

Free length
830 mm

Fork weight, includes clamps and steerer
22 lbs / 10kg

Stanchions
Ø43, high tensile steel with hard chrome

Outer tubes
Seamless 7050 aluminum, type 3 hard anodized coating

Drop outs
Forged 6061 aluminum, type 3 hard anodized coating

Triple clamps
Forged 6061 aluminum, type 3 hard anodized coating

Steer tube
Seamless 7050 aluminum, type 2 anodized coating

Damping
• Symmetrical and adjustable closed cartridge with spring backed modified IFP
• High-flow pistons + fully tunable compression and rebound valving
• Dual oil circuits for optimum performance. Separating lubrication and damping oils allows us to further optimize high and low speed damping performance.
• Balanced load, race-ready, high performance. No matter how hard you ride or how many laps you take, our closed cartridge forks will never fade and will always feel predictable.
• Hydraulic bump stop is a hydraulic bottom out control system that gives you soft landings and max stroke even on the most aggressive impacts.

Damper bodies
Seamless 7050 aluminum, type 3 hard anodized coating

Rebound
Dual side high tensile steel spring, adjustable

Adjusters
External compression and rebound adjustment

Seals
NBR

Guards
High impact PP, 210-degree wraparound

BUY NOW FROM ZERO MOTORCYCLES

View details

Super responsive.
Purpose-tuned.

Built specifically for the Zero XE.

The Sirris F43 XE Trail Tune fork brings true closed-cartridge suspension performance to the front of the bike, with two independent sealed dampers engineered for consistent support, reduced friction, and confident trail control.

The Partnership

Sirris Suspension — Engineering & Manufacturing

Sirris designed and produced the suspension hardware used in this system. That includes:

The fork and rear shock platforms
Internal architecture and component design
Manufacturing, assembly, and quality control

Sirris’ responsibility is the suspension units themselves—their engineering integrity, structural performance, and build quality.

Zero Motorcycles — Tune Development & Installation Integration

Zero Motorcycles led the development of the ride character and integration for the XE model.

That includes:

Defining ride goals for the XE platform
Developing the wide-range trail tune
Testing across varied terrain conditions
Validating fitment and chassis compatibility
Establishing installation procedures

This suspension system was tuned specifically for the Zero XE as a complete vehicle—not just as individual components.

Unlike a custom race conversion, this setup was engineered as a direct bolt-on replacement for the stock suspension.

For that reason, Zero Motorcycles owns the vehicle-side tuning philosophy and installation guidance for this application.

Why Tune & Fitment Are Owned by Zero Motorcycles

Suspension performance is not just about hardware—it’s about how that hardware interacts with the motorcycle’s geometry, weight balance, and intended use. For the XE platform:

Zero defined the wide-range valving
Zero validated spring rates for general-use riding
Zero confirmed geometry compatibility
Zero established installation procedures

Sirris manufactures the suspension units to Zero’s specification. However:

Sirris does not control the motorcycle chassis
Sirris does not define vehicle geometry targets
Sirris does not publish vehicle-specific setup instructions

Because this is a vehicle-integrated application, all XE-specific tuning intent, setup recommendations, and installation instructions are developed and supported by Zero Motorcycles.

If you have questions regarding bike setup, torque specifications, ride modes, or compatibility with other XB components, please contact Zero Motorcycles directly.

Responsibility & Authenticity

We’re proud of this collaboration—and clarity matters.

Sirris stands behind the engineering and manufacturing of the fork.
Zero Motorcycles stands behind the vehicle integration, tuning specification, and installation guidance for the XE application.

Both teams share a commitment to thoughtful engineering and rider-focused innovation.

Because this system installs as a direct replacement for the stock suspension, proper installation according to Zero Motorcycles’ published procedures is essential to ensure safety and performance.