Upgrade your Surron Light Bee X with the Sirris F43 CMX Tune Fork, engineered for riders who demand top-tier performance and control. Designed with precision damping and customizable spring options, this fork delivers unmatched stability whether you’re tackling dirt trails or smooth street rides
Weight Range Options
Sirris offers two custom tuning options to match your riding style and weight perfectly. (Note: Weight ranges are measured without gear; 15 lbs of gear weight is already factored in.)
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MEDIUM: 60–82 kg / 140–180 lbs (Springs: 3.6 / 3.2)
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HEAVY: 82–100 kg / 180–220 lbs (Springs: 3.6 / 3.6)
Each setup ensures optimal suspension balance, giving you maximum confidence on every ride.
Fork Specifications
Architecture: Upside-down (USD) fork design for increased rigidity and precise handling.
Travel: 220 mm of smooth suspension movement for aggressive off-road riding.
Free Length: 775 mm (Optional drop clamp adds +25 mm for extended reach).
Fork Spacing: 178 mm – compatible with all tire types (dirt or street).
Weight: 4 kg per leg, offering robust durability without performance compromise.
High-Quality Construction
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Stanchions: Ø43 mm high-tensile steel with hard chrome finish for superior strength.
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Outer Tubes: Seamless 7050 aluminum with Type 3 hard anodized coating.
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Drop Outs: 6061 aluminum with Type 2 anodized coating and replaceable caliper mount brackets for easy upgrades.
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Axle: Ultra-high tensile hard-chromed axle enhances steering accuracy and rider confidence.
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Triple Clamps: CNC billet 6061 aluminum, Type 2 anodized, available in black or blue. Optional drop clamp supports 21” front wheel conversion (black only).
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Steer Tube: Seamless 7050 aluminum with Type 2 anodized coating for added resilience.
Damping & Adjustability
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System: Symmetrical closed cartridge with spring-backed modified IFP for smoother response.
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Damper Bodies: Seamless 7050 aluminum, Type 3 hard anodized.
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Rebound: Dual-side high tensile steel spring, fully adjustable.
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Adjusters: External tool-free compression and rebound tuning (rebound fine-tuned via tool).
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Seals: NOK MX seals ensure long-lasting performance.
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Bushings: Daido MX bushings for low friction and extended service life.
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Guards: High-impact PP with 210° wraparound protection.
Why Choose the Sirris F43 CMX Fork?
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Tuned specifically for Surron Light Bee X riders
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Delivers race-level control and stability
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Crafted from premium aerospace-grade materials
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Custom spring rates to match rider weight and style
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Ideal for off-road adventures and high-speed stability
Experience the difference with the Sirris F43 CMX Tune Fork — precision-engineered to push your Light Bee X to its full potential.
Why Choose to Buy from eBikePartsNZ
At eBikePartsNZ, we’re passionate about performance, quality, and reliability. When you buy your Sirris F43 CMX Fork from us, you get more than just a product — you get guaranteed support and authentic parts trusted by New Zealand’s top riders.
- 100% Genuine Sirris products: No copies or fakes
- Local NZ stock: With fast shipping nationwide
- Expert customer support from e-bike specialists
- Competitive pricing and secure checkout
- Trusted by riders for premium e-bike parts and upgrades





















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