Sirris R46 SHOCK FOR ZERO XE
R46 Zero XE Trail Tune | LSC | Zero XE
Engineered by Sirris, tuned by Zero Motorcycles, and built to unlock balanced trail performance from the rear of the bike.
The Sirris R46 XE shock is a direct-fit suspension upgrade developed around the XE platform’s geometry, weight balance, and real-world trail demands.
RIDER WEIGHT SPECS:
Sirris offers one weight range (160 lbs - 180 lbs) to choose from when selecting your Zero XE Trail Tune R46 shock. (Listed weight ranges are rider weight without riding gear on. 15 pounds of riding gear is calculated into the weight ranges)
PRODUCT SPECS:
Architecture
Piggyback, steel spring
Stroke
90 mm
Length
475 mm
Weight
3.9 lbs / 1.76 kg without spring
Piston
High flow Ø46 mm, CNC 6061 billet aluminum, type 3 hard anodized coating
Piston band
Hard band
Shaft
Ø16 mm OD chrome-plated, induction hardened steel, hollow, Ø 5.5 mm ID
Shock body
Seamless 6061 aluminum, type 3 hard anodized coating, ACME thread
Spring retainer
Seamless 6061 aluminum, type 3 hard anodized coating, ACME thread, with locking feature, manual adjust
Bottom out
MCU bumper
Top out
Rubber bumper
Damping
Tunable compression and rebound
Reservoir
Pressurized with floating piston
Adjusters
External compression and rebound adjustment
Seals
NBR
The Sirris R46 XE shock is a direct-fit suspension upgrade developed around the XE platform’s geometry, weight balance, and real-world trail demands.
With wide-range trail valving, adjustable low-speed compression, rebound, and spring preload, it gives riders the support, comfort, and control needed to ride faster, longer, and with more confidence. Tuned for trail riding as part of a complete vehicle system—not a generic race conversion—the XE shock brings Sirris hardware and Zero-developed ride character together in one refined rear suspension package.
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.
ZERO XE OWNER'S GUIDE
Sirris F43 fork and R46 shock for Zero XE - torque specs, tuning charts and more.
SERVICE PARTS
R46 Zero XE shock service parts available now.
