Proven at the highest level.
Refined through real-world feedback.
The next evolution of Sirris suspension for the Surron Ultra Bee is here. The updated F43 fork and R46 shock build on a proven high-performance platform, bringing targeted refinements, increased capability, and greater adjustability to riders across Trail, MX, and SX applications.
This isn't about reinventing what already works. It's about making a proven system even better.
Developed through extensive real-world testing and years of rider feedback, the latest updates reflect experience gained across the entire spectrum of riding—from professional athletes pushing the limits of SX and MX to dedicated trail riders putting serious hours on their bikes. Every refinement serves a purpose: improve suspension balance, expand adjustability, enhance control, and deliver a more dialed-in ride.
The result is a more refined suspension package engineered to meet the demands of today's Ultra Bee riders, whether charging hard at the track or pushing deeper into technical terrain.
F43 FORK
NOW WITH 260MM TRAVEL
The updated Sirris F43 brings meaningful performance and usability improvements across the Trail, MX, and SX platforms, combining increased travel where it matters with improved adjustability, enhanced serviceability, and a fresh new look.
260MM TRAVEL
BUILT FOR BIGGER DEMANDS.
For Trail and MX configurations, fork travel increases from 246mm to 260mm, providing additional suspension capacity when the terrain gets rough. The added travel gives the fork more room to manage aggressive impacts, absorb demanding terrain, and maintain control deeper into the stroke.
The SX configuration already utilizes 260mm of travel and retains its proven setup, with no change to extended length.
TOOL-FREE ADJUSTABILITY
All three F43 tunes now feature an updated top-cap adjustment system with the signature Sirris blue adjuster. Suspension adjustments are quicker and easier to access without reaching for tools, making it simpler to fine-tune the setup at the track, on the trail, or between riding sessions.
UPGRADED TORX FASTENERS
Durability and serviceability receive a practical upgrade with the introduction of Torx fasteners throughout the F43 platform. Designed to provide a more secure tool interface and improved resistance to rounding when properly engaged, the updated hardware delivers a robust solution for riders, mechanics, and professional service environments.
REFINED TRAIL TUNE SPRING BALANCE
Built on two years of rider feedback and real-world experience, the Trail tune receives a targeted spring-balance refinement designed to better support riders toward the heavier end of the recommended weight range.
On a smaller electric motorcycle carrying a larger rider, weight distribution plays a significant role in how the front and rear suspension work together. The updated spring balance better accounts for typical rider loading, helping maintain appropriate front-end support and a more balanced, controlled feel throughout the suspension's travel.
The objective is to preserve the plush, controlled ride quality that defines the Sirris Trail tune while delivering more appropriate support where it matters most. Individual riding style and body positioning still influence suspension balance, and riders with unique setup requirements may benefit from further spring-rate adjustments.
The MX and SX fork spring rates remain unchanged.
A FRESH NEW LOOK
Updated fork guard graphics complete the F43 refresh across Trail, MX, and SX models. The new decal package brings a sharper, updated Sirris appearance to a suspension platform built for serious performance.
R46 SHOCK
MORE ADJUSTABILITY. MORE REFINEMENT.
The updated Sirris R46 takes rear suspension performance further with the introduction of Sirris 2SC (Two-Stage Compression), along with targeted tuning refinements across the Trail, MX, and SX configurations.
The focus is straightforward: give riders more meaningful control over suspension response while continuing to deliver the connected, composed ride feel that defines Sirris performance.
INTRODUCING SIRRIS 2SC
The new 2SC system (two stage compression) provides independent low-speed and high-speed compression adjustments, giving riders greater control over how the shock responds to different terrain, riding conditions, and impacts.
Low-speed compression fine-tunes chassis support and suspension response during slower shaft movement, helping dial in stability, balance, and control through corners, transitions, and changes in terrain.
High-speed compression manages the rapid shaft movement generated by bigger, faster impacts—including jump landings, whoops, square-edge hits, and sharp-edged terrain.
With two independent adjustment ranges, riders can better tailor shock performance to their riding style and terrain without relying on a single compression setting to manage every situation.
The result is a more versatile, adjustable rear suspension platform designed to deliver control when riding aggressively and composure when the terrain gets unpredictable.
TRAIL TUNE
A MORE BALANCED SETUP
The R46 Trail tune receives targeted spring-rate and clicker-setting refinements designed to improve overall balance with the Ultra Bee's linear rear suspension linkage.
For Trail Heavy and higher-weight applications, an updated bumper is designed to work with the revised setup, helping deliver a more balanced end-of-stroke feel and improved control through the final portion of suspension travel. Trail LTE and Medium configurations retain their existing bumper specification.
Together, these changes focus on better matching spring support, damping response, and end-of-stroke performance to the demands of real-world trail riding.
MX TUNE
REFINED FOR RIDERS WHO PUSH HARDER
The R46 MX tune receives targeted rebound refinements informed directly by feedback from high-level and professional riders.
Updated rebound settings are designed to improve shock recovery, response, and overall control during aggressive riding. The goal is a more composed feel when charging through demanding sections, linking consecutive impacts, and pushing the Ultra Bee harder.
The core MX platform remains proven. These refinements build on that foundation, translating feedback from riders operating at the highest level into a more dialed-in production suspension setup.
Because pro-level development shouldn't stop at the race bike.
SX TUNE
EVOLVED FOR EXTREME DEMANDS
The SX configuration retains its existing bumper specification while receiving the broader 2SC platform update and revised clicker settings.
Combined with independent low-speed and high-speed compression adjustment, these refinements give riders greater flexibility to fine-tune shock response for aggressive riding, demanding terrain, and individual setup preferences.
UPDATED RESERVOIR GRAPHICS
The R46 refresh is completed with a new reservoir decal package across Trail, MX, and SX models. The updated graphics bring the shock in line with the latest Sirris design language, matching its refined performance with a fresh, unmistakable look.
REFINED THROUGH EXPERIENCE.
BUILT TO RIDE HARDER.
The latest Sirris F43 fork and R46 shock represent what happens when proven suspension performance meets continued development. More travel on the F43 Trail and MX tunes. Tool-free adjustment across the fork lineup. Enhanced hardware. A refined Trail spring balance. And the introduction of 2SC compression adjustment alongside targeted shock tuning updates.
Every change has a purpose, informed by the riders who put these products to the test.
This is the next evolution of Sirris suspension for the Surron Ultra Bee—refined through real-world feedback, developed for demanding conditions, and built to deliver the performance riders expect from Sirris.
More adjustability. More refinement. More performance where it counts.
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