Sirris F43 CMX 220mm Tool-Free LSC Fork | By Sirris Suspension | For E-Ride Pro SS 3.0
Built to Dominate Any Terrain, Any Time
At REV Rides we work with a lot of suspension upgrades, and the Sirris F43 CMX Fork is easily one of the most impressive compact e-moto forks available today. Designed specifically for platforms like the E-Ride Pro SS 3.0, this fork delivers full-size motocross level performance in a chassis optimized for lightweight electric bikes.
The F43 CMX combines an oversized 43mm upside-down race chassis with Sirris’ proprietary CMX tuned closed cartridge damping system. The result is razor sharp handling, incredible front end confidence, and consistent control when riding aggressively on trails, tracks, or rough terrain. With 220mm of suspension travel, tool free compression adjustment, and race grade materials throughout the fork, this is a serious upgrade over stock suspension.
Sirris started with their race-proven F43 platform and resized it specifically for compact electric motos. The 775mm chassis length, oversized stanchions, and billet clamps create a stronger and more planted front end while maintaining the agility these bikes are known for. The design focuses on eliminating flex, improving durability, and delivering predictable suspension performance even when the bike is pushed hard.
Oversized Chassis Designed to Outperform
43mm hard chrome stanchions resist flex, dents, and wear
7XXX series hard anodized uppers maximize strength and durability
775mm extended fork length creates a longer and more stable front end
220mm travel provides 20mm more travel than stock suspension
Billet aluminum triple clamps increase stiffness and reduce twisting
Direct mount stem compatibility improves cockpit stiffness
Ultra stiff chromoly race axle increases steering precision and front end feel
Motorcycle style top cap improves steering bearing tension control
Replaceable brake mounts and wheel spacers allow brake and wheel upgrades
This design focuses on more than just stiffness. The F43 CMX is built to improve balance, soak up hard impacts, and maintain long term durability for riders pushing higher speeds and rougher terrain.
Race Grade CMX Closed Cartridge Damping
At the core of the fork is the CMX tuned symmetrical closed cartridge damper. This advanced system provides professional level damping performance with independent oil circuits that separate lubrication and damping oil. This design helps maintain consistent performance even during long aggressive riding sessions.
CMX Compact Motocross Tune designed for aggressive riding
Independent oil circuits isolate damping and lubrication oil
High flow pistons with fully tunable compression and rebound valving
Hydraulic bottom out control protects against harsh landings
Hard anodized internal components reduce wear and increase longevity
Premium Daido bushings and NOK MX seals ensure smooth operation
The CMX tuning delivers a planted and predictable ride feel. From aggressive trail riding to high speed track laps, the fork stays composed and easy to tune for rider preference.
Tool-Free Compression Adjustment
The F43 CMX features tool free compression adjusters, allowing riders to quickly adjust suspension settings without tools. With nearly 30 clicks of external adjustment, dialing in the fork for different terrain or riding styles is fast and simple.
Direct Mount Stem System
The Sirris steerer tube and motorcycle style top cap system are designed for direct mount stems. This setup improves cockpit stiffness and helps maintain consistent steering bearing torque, similar to larger motocross bikes.
The stock E-Ride Pro stem is not compatible because the Sirris steerer tube cannot be clamped. We recommend using a Warp 9 direct mount stem or the Heavy Hitter Adjustable Billet Display Mount by GritShift.
Optional Drop Clamp for Big Wheel Builds
The optional drop clamp raises the front end an additional 25mm, extending fork length to approximately 800mm. This allows riders to run a 21 inch front wheel while maintaining proper bike balance when paired with longer rear suspension.
Rider weight ranges are calculated without riding gear. Approximately 15 pounds of riding gear is factored into the recommended range. Any upgrades such as heavier batteries or controllers should be added to rider weight when selecting spring rates.
CMX Tune Setup Notes
Factory settings are measured in clicks from the fully closed position
Back adjusters out from closed position to reach factory settings
Riders near a weight cutoff may adjust preload to fine tune sag
Aggressive riders may benefit from moving up one spring class
Riding style and terrain may require further tuning
Fitment
E-Ride Pro SS 3.0
Who This Fork Is Perfect For
E-Ride Pro riders building a race ready or track focused setup
Trail riders who want maximum front end stability and durability
High power builds that need true motocross level suspension performance
Shop Pay offers you the option to pay in full at checkout, or to split your purchase into regular payments with Shop Pay Installments. Simply select Shop Pay at checkout to get started.
Rates from 0%-36% APR. Payment options through Shop Pay Installments, are subject to an eligibility check and are provided by these lending partners: affirm.com/lenders. Options depend on your purchase amount, and a down payment may be required. State notices to consumers https://www.affirm.com/licenses.
Shop your favorite stores online or in-store and pay later with Affirm. You’ll see us at checkout, or you can request a virtual card in the Affirm app. Simply select Affrim at checkout to get started. Click here to learn more about Affirm
Your rate will be 0-36% APR based on credit, and is subject to an eligibility check. For example, a $700 purchase might cost $63.18/mo over 12 months at 15% APR. Payment options through Affirm are provided by these lending partners: affirm.com/lenders. Options depend on your purchase amount and a down payment may be required.
SKIP THE LINE
Checkout instantly with Express Checkout:
Pre-fill shipping and payment information using your Apple Pay, Google Pay, PayPal, Shop Pay, or Meta Pay account. Simply select your preferred payment provider at checkout to get started
Fitment: Sirris F43 CMX Tune 220mm Fork | Tool free LSC | for E-Ride Pro SS 3.0
Eride pro SS 3.0
This product may be compatible with more models than shown above. Please see the product description for full details, or contact us for help with fitment.
