Turn your E-Ride Pro into an outright weapon.

Sirris Suspension and Mayhem Racing teamed up to deliver a purpose-built, race-only suspension system that completely redefines what’s possible on a compact e-moto. This isn’t an upgrade—it’s a transformation.

Designed exclusively for elite riders chasing wins, this custom Sirris Pro MX race-only tune unlocks true big-bike performance on the E-Ride Pro SR. You get access to the race-proven R46 rear shock platform paired with a 230mm travel fork (826mm extended length)—a combination that simply doesn’t exist anywhere else for this class of bike.

The result? Two additional inches of ground clearance. Massive suspension authority. Total control at speed. From flat-out straights to deep whoops and send-it landings, this kit delivers the confidence and composure of a full-size race bike in a compact, ultra-aggressive e-moto package.

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R46 Mayhem Racing Tune | Tool Free LSC | E-Ride Pro SR

R46 Mayhem Racing Tune | Tool Free LSC | E-Ride Pro SR

$899.00 USD
$899.00 USD
Sale Sold out
Rider Weight Range

Weight Range

Sirris offers a single weight range for Mayhem Racing custom Pro MX Tune for E-Ride Pro SR. (Listed weight range is rider weight without riding gear on. 15 pounds of riding gear is calculated into the weight ranges)

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

 

SHOCK SPECS:

Sirris offers a single weight range for Mayhem Racing custom Pro MX Tune R46 shock for E-Ride Pro SR. (Listed weight range is rider weight without riding gear on. 15 pounds of riding gear is calculated into the weight ranges)

140 lbs - 180 lbs  (Medium = 75 N/mm spring)

 

Architecture
Piggyback, steel spring

Stroke
81.2 mm

Length
317 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
• Custom, Pro MX tune, developed in partnership with Mayhem Racing
• LSC (Low Speed Compression)
• Superior pressure balance and frequency response providing the ultimate overall responsiveness and performance for riders.
• Tunable compression and rebound

Reservoir
Pressurized with floating piston

Adjusters
External tool-free compression, rebound adjustment
(rebound adjusted using tool)

Seals
NBR

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PRO MX TUNE

This setup was born on the racecourse, originally developed for Arenacross, then refined through hands-on testing and collaboration with the Mayhem Racing team. Both the Sirris F43 fork and R46 shock feature a custom, Pro MX race-only tune built for riders who push hard and land harder.

Tune characteristics:

  • Stiff, aggressive MX race valving
  • Hybrid MX/SX philosophy
  • Maximum support for:
    - Huge jumps
    – High-speed whoops
    – Hard charging corner entry and exit

    This tune is all about control, precision, and stability when it matters most. It rewards commitment, holds its line under abuse, and stays composed when lesser setups fold.

REQUIRED SHOCK HARDWARE KIT

This is a true race setup, and proper installation is part of the deal.

To fit the E-Ride Pro SR:

  • A Mayhem Racing custom upper gooseneck adapter is required to fit the rear shock onto the frame
  • Installation involves drilling the frame
  • Clear guidelines are provided, and the process is straightforward
  • All parts and hardware are included with the kit
  • Optional step: If you want to use the larger bolt for bottom linkage, the stock linkage must be drilled to accept the new supplied larger bolt
  • No modifications to the frame are needed for the front fork

These modifications are what allow this platform to exist—and they’re what separate a race-winning build from a bolt-on compromise.

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EASY INSTALL

No shortcuts. No compromises. Just pure race performance.

If you’re racing to win—and you want the most advanced suspension ever put on an E-Ride Pro SR—this is it.

SUSPENSION

Sirris x Mayhem Racing suspension products >

The Partnership

  • Sirris Suspension — Engineering & Manufacturing

    Sirris designed and produced the race-spec fork and shock used in this build. That includes:

    • The F43 fork (230mm travel / 826mm extended length)
    • The R46 rear shock platform
    • Internal valving and Pro MX race-only tune
    • Component manufacturing, assembly, and quality control

    Sirris’ responsibility is the suspension units themselves—their engineering, performance characteristics, and manufacturing integrity.

    LEARN MORE ABOUT SIRRIS 

  • Mayhem Racing — Fitment Development & Installation Authority

    Tim at Mayhem Racing led the development of the bike-side integration for the E-Ride Pro SR platform.

    That includes:

    • Defining geometry targets
    • Determining required chassis modifications
    • Designing the custom upper gooseneck adapter
    • Establishing linkage changes and hardware spec
    • Creating and owning all installation procedures and instructions

    This system requires structural modifications to the E-Ride Pro SR chassis in order to achieve proper geometry, clearance, and race performance. Those modifications were developed, tested, and validated by Mayhem Racing.

    For that reason, Mayhem Racing is the sole authority on installation instructions and chassis modification guidance.

  • Why Installation Is Owned by Mayhem Racing

    This is not a bolt-on kit.

    To achieve this level of race performance, the platform requires:

    • A Mayhem Racing custom upper gooseneck adapter
    • Frame drilling and precision shimming
    • Drilling of the stock linkage to accept a larger bolt
    • Geometry-specific setup procedures

    These modifications fundamentally alter how the suspension integrates with the chassis.

    Sirris does not manufacture the E-Ride Pro SR frame, does not control its tolerances, and does not oversee individual installations. Because of this:

    • Sirris cannot validate third-party installation work
    • Sirris cannot assume liability for improper installation
    • Sirris does not publish or control chassis modification procedures

    All installation instructions, fitment specifications, and geometry guidance are created, maintained, and supported by Mayhem Racing.

    If you have questions about fitment, drilling procedures, adapters, hardware, torque specs, or chassis prep—contact Mayhem Racing directly.

  • Responsibility & Authenticity

    We’re proud of this collaboration—and we want to be clear and transparent about it.

    • Sirris stands behind the engineering and manufacturing of its fork and shock.
    • Mayhem Racing stands behind the fitment design and installation process.

    Both companies share a passion for innovation, rider progression, and building things that didn’t exist before.

    Clarity matters.

    This system performs at an elite level because it was developed intentionally, installed precisely, and ridden aggressively. 

    Proper installation is not optional—it is fundamental to safety and performance.

OWNER'S GUIDE

Sirris F43 and R46 Mayhem Racing suspension for E-Ride Pro SR. Torque specs, install guide, service intervals and more.

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SIRRIS SUSPENSION

Sirris doesn't build average suspension — they engineer the performance standard for the e-moto industry.

This is true high-performance suspension, designed to outperform stock and aftermarket alternatives in every measurable way:

  • Lower hysteresis for more responsive tracking and better small-bump sensitivity
  • Higher durability to withstand the torque, weight, and aggressive riding styles unique to modern e-motos
  • Greater force capacity to handle bigger hits, harder braking, and higher speeds without fading
  • Advanced high-flow damping circuits allows for greater force capacity without creating harshness
  • Increased chassis stiffness for precise steering feedback and stability

These attributes aren’t marketing claims — they are the foundation of real capability. The difference is control under load, consistency over time, and confidence at speed.

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