{"product_id":"sirris-f43-cmx-220mm-fork-tool-free-lsc-zero-xb","title":"Sirris F43 CMX 220mm Fork | Tool free LSC | Zero XB","description":"\u003ch1\u003eSirris F43 CMX 220mm Tool-Free LSC Fork | By Sirris Suspension | For Zero XB\u003c\/h1\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003cstrong\u003eComing soon!\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003eBuilt to Dominate Any Terrain, Any Time\u003c\/h2\u003e\n\u003cp\u003eAt REV Rides we see a lot of riders pushing the \u003cstrong\u003eZero XB\u003c\/strong\u003e harder than its stock suspension was ever designed for. The \u003cstrong\u003eSirris F43 CMX Fork\u003c\/strong\u003e is one of the most serious upgrades you can install if you want to unlock the true performance potential of this platform. This fork brings full-size motocross suspension engineering to compact electric bikes, giving riders a front end that feels stronger, more precise, and far more capable in aggressive riding conditions.\u003c\/p\u003e\n\u003cp\u003eThe F43 CMX combines an oversized \u003cstrong\u003e43mm upside-down race chassis\u003c\/strong\u003e with Sirris’ proprietary \u003cstrong\u003eCMX tuned closed cartridge damping system\u003c\/strong\u003e. The result is razor sharp handling, incredible front-end confidence, and a suspension platform that stays consistent even when speeds pick up and terrain gets rough. With \u003cstrong\u003e220mm of travel\u003c\/strong\u003e, tool-free compression adjustment, and race-grade materials throughout the fork, this upgrade dramatically improves the ride quality and control of the Zero XB.\u003c\/p\u003e\n\u003cp\u003eSirris built the F43 platform by taking their race-proven fork architecture and resizing it for compact e-moto bikes. The \u003cstrong\u003e775mm extended chassis\u003c\/strong\u003e, oversized stanchions, and billet clamps create a longer, stiffer, and more planted front end while still keeping the bike responsive. The entire design focuses on reducing flex, improving durability, and delivering predictable performance when riders push these bikes harder on trails, jumps, and technical terrain.\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ciframe title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/n4_QaBwQrRE?si=6srx8KQMC7FEOymB\" height=\"315\" width=\"560\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003ch3\u003eOversized Chassis Designed to Outperform\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e43mm hard chrome stanchions\u003c\/strong\u003e resist flex, dents, and wear\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e7XXX series hard anodized uppers\u003c\/strong\u003e maximize strength and durability\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e775mm extended fork length\u003c\/strong\u003e creates a longer and more planted front end\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e220mm travel\u003c\/strong\u003e delivers 20mm more suspension travel than many stock compact e-moto forks\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLightweight billet aluminum clamps\u003c\/strong\u003e increase stiffness and reduce twisting under load\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e178mm fork spacing\u003c\/strong\u003e allows nearly unlimited tire choices for dirt or street setups\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect mount stem compatibility\u003c\/strong\u003e improves cockpit stiffness and steering feel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustom ultra stiff chromoly axle\u003c\/strong\u003e improves steering precision and predictability\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotorcycle style top cap system\u003c\/strong\u003e provides more consistent steering bearing tension\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaceable brake caliper adapters and wheel spacers\u003c\/strong\u003e allow brake and wheel upgrades\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe result is a fork that is not just stiffer. It is stronger where it matters, absorbs impacts better, and maintains consistent performance during long aggressive rides.\u003cbr\u003e\u003cmeta charset=\"utf-8\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ciframe title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/y8ZjgHK3_Vc?si=3FkKGJa3XNa6oJMZ\" height=\"315\" width=\"560\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003cdiv class=\"product-block product-block--tab\"\u003e\n\u003cdiv class=\"collapsibles-wrapper collapsibles-wrapper--border-bottom\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eRace Grade CMX Closed Cartridge Damping\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the F43 CMX is Sirris’ \u003cstrong\u003eCMX tuned symmetrical closed cartridge damper\u003c\/strong\u003e. This advanced system delivers professional level damping performance using independent oil circuits that separate lubrication and damping oil. This design keeps the fork running cool and consistent even when riding hard for extended sessions.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCMX Compact Motocross Tune\u003c\/strong\u003e designed for aggressive compact e-moto riding\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrue symmetrical closed cartridge system\u003c\/strong\u003e provides fade-free damping\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndependent oil circuits\u003c\/strong\u003e separate lubrication and damping oil\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh flow pistons\u003c\/strong\u003e with tunable compression and rebound valving\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHydraulic bottom-out control\u003c\/strong\u003e protects against harsh impacts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHard anodized internal components\u003c\/strong\u003e reduce wear and extend service life\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePremium Daido bushings and NOK MX seals\u003c\/strong\u003e deliver smooth action and durability\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCMX tuning gives the Zero XB a planted, predictable ride feel that riders notice immediately. Whether riding technical trails or pushing faster off-road sections, the fork stays controlled and highly tunable.\u003c\/p\u003e\n\u003ch3\u003eTool-Free Compression Adjustment\u003c\/h3\u003e\n\u003cp\u003eThe F43 CMX features \u003cstrong\u003etool-free compression adjusters\u003c\/strong\u003e, allowing quick suspension tuning without tools. Riders get nearly \u003cstrong\u003e30 clicks of external compression adjustment\u003c\/strong\u003e, making it easy to adapt the fork to different terrain or riding styles.\u003c\/p\u003e\n\u003ch3\u003eDirect Mount Stem System\u003c\/h3\u003e\n\u003cp\u003eThe Sirris steerer tube and motorcycle-style top cap system are designed around a \u003cstrong\u003edirect mount stem setup\u003c\/strong\u003e. This improves cockpit stiffness and helps maintain consistent steering bearing torque similar to larger motocross bikes.\u003c\/p\u003e\n\u003ch3\u003eOptional Drop Clamp for Big Wheel Builds\u003c\/h3\u003e\n\u003cp\u003eThe optional \u003cstrong\u003edrop clamp\u003c\/strong\u003e raises the front end an additional \u003cstrong\u003e25mm\u003c\/strong\u003e, extending overall fork length to approximately \u003cstrong\u003e800mm\u003c\/strong\u003e. This allows riders to run a \u003cstrong\u003e21 inch front wheel\u003c\/strong\u003e while maintaining bike balance when paired with a longer rear suspension setup.\u003c\/p\u003e\n\u003ch3\u003eAxle and Brake Mount System\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eUltra stiff chromoly axle improves steering precision and front-end feel\u003c\/li\u003e\n\u003cli\u003eReplaceable caliper mount brackets allow brake upgrades\u003c\/li\u003e\n\u003cli\u003eDesigned for \u003cstrong\u003e220mm brake rotor setups\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eAll Sirris brake brackets are designed for 220mm rotors\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eArchitecture:\u003c\/strong\u003e Upside down fork\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTravel:\u003c\/strong\u003e 220 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree Length:\u003c\/strong\u003e 775 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtended Length with Drop Clamp:\u003c\/strong\u003e Approximately 800 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFork Spacing:\u003c\/strong\u003e 178 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 4 kg per leg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStanchions:\u003c\/strong\u003e Ø43 mm high tensile steel, hard chrome\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Tubes:\u003c\/strong\u003e Seamless 7050 aluminum, Type 3 hard anodized coating\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrop Outs:\u003c\/strong\u003e 6061 aluminum, Type 2 anodized coating\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAxle:\u003c\/strong\u003e Ultra high tensile hard chromed axle\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTriple Clamps:\u003c\/strong\u003e Billet 6061 aluminum, Type 2 anodized coating, Black or Blue\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSteer Tube:\u003c\/strong\u003e Seamless 7050 aluminum, Type 2 anodized coating\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDamping:\u003c\/strong\u003e Symmetrical adjustable closed cartridge with spring backed modified IFP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDamper Bodies:\u003c\/strong\u003e Seamless 7050 aluminum, Type 3 hard anodized coating\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompression Adjustment:\u003c\/strong\u003e External tool-free compression adjuster\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRebound:\u003c\/strong\u003e Dual side high tensile steel spring, adjustable (rebound adjusted using tool)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeals:\u003c\/strong\u003e NOK MX seals\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBushings:\u003c\/strong\u003e Daido MX bushings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFork Guards:\u003c\/strong\u003e High impact PP, 210-degree wraparound\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpring Rate Options\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMedium:\u003c\/strong\u003e 140 to 180 lb rider weight, 3.6 \/ 3.2 springs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy:\u003c\/strong\u003e 180 to 220 lb rider weight, 3.6 \/ 3.6 springs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eRider weight ranges are based on body weight without riding gear. Sirris factors approximately 15 pounds of riding gear into the recommended ranges. Any heavier upgrades such as batteries or controllers should be added to rider weight when selecting spring rates.\u003c\/p\u003e\n\u003ch3\u003eCMX Tune Setup Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFactory settings are measured in clicks from the fully closed position\u003c\/li\u003e\n\u003cli\u003eOnce closed fully clockwise, back adjusters out counter-clockwise to reach the recommended starting settings\u003c\/li\u003e\n\u003cli\u003eRiders near a weight cutoff may adjust preload to fine tune sag\u003c\/li\u003e\n\u003cli\u003eAggressive riders may benefit from moving up one spring class and lowering preload\u003c\/li\u003e\n\u003cli\u003eRider preference and terrain conditions may require further tuning\u003c\/li\u003e\n\u003cli\u003eExample: a 160 lb rider with 20 lb of upgrades calculates to 180 lb total system weight\u003c\/li\u003e\n\u003cli\u003eAggressive rider at 180 lb may prefer the heavy tune with lower preload\u003c\/li\u003e\n\u003cli\u003eRelaxed rider at 180 lb may run the medium tune with higher preload\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eZero XB\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWho This Fork Is Perfect For\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eZero XB riders building a \u003cstrong\u003ehigh performance off-road setup\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eTrail riders who want \u003cstrong\u003ebetter front-end stability and durability\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eUpgraded builds that need \u003cstrong\u003etrue motocross level suspension performance\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cmeta charset=\"utf-8\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"product-block product-block--tab\"\u003e\n\u003cdiv class=\"collapsibles-wrapper collapsibles-wrapper--border-bottom\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Sirris Store","offers":[{"title":"220mm - Medium (140-180lbs) \/ CMX - Standard Clamp \/ Black","offer_id":51415114907938,"sku":null,"price":2250.0,"currency_code":"USD","in_stock":false},{"title":"220mm - Medium (140-180lbs) \/ CMX - Standard Clamp \/ Blue","offer_id":51415114940706,"sku":null,"price":2250.0,"currency_code":"USD","in_stock":false},{"title":"220mm - Medium (140-180lbs) \/ CMX - Drop Clamp \/ Black","offer_id":51415114973474,"sku":null,"price":2350.0,"currency_code":"USD","in_stock":false},{"title":"220mm - Medium (140-180lbs) \/ CMX - Drop Clamp \/ Blue","offer_id":51415115006242,"sku":null,"price":2350.0,"currency_code":"USD","in_stock":false},{"title":"220mm - Heavy (180-220 lb) \/ CMX - Standard Clamp \/ Black","offer_id":51415115039010,"sku":null,"price":2250.0,"currency_code":"USD","in_stock":false},{"title":"220mm - Heavy (180-220 lb) \/ CMX - Standard Clamp \/ Blue","offer_id":51415115071778,"sku":null,"price":2250.0,"currency_code":"USD","in_stock":false},{"title":"220mm - Heavy (180-220 lb) \/ CMX - Drop Clamp \/ Black","offer_id":51415115104546,"sku":null,"price":2350.0,"currency_code":"USD","in_stock":false},{"title":"220mm - Heavy (180-220 lb) \/ CMX - Drop Clamp \/ Blue","offer_id":51415115137314,"sku":null,"price":2350.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0093\/1672\/8892\/files\/sirris-F43-220-ZERO-XB-suspension-fork-front-CMX-black.webp?v=1773352753","url":"https:\/\/revrides.com\/products\/sirris-f43-cmx-220mm-fork-tool-free-lsc-zero-xb","provider":"REVRides","version":"1.0","type":"link"}