Sirris F43 Front Fork for Surron Ultra Bee

Experience next-level E-Moto suspension performance with the Sirris F43 Fork, engineered for precision, durability, and race-ready control. Designed for aggressive riding, this fork balances plush comfort with precise handling, giving your Ultra Bee unmatched front-end performance.

Precision, Durability, and Performance

• True Symmetrical Closed Cartridge – Balanced, predictable damping for consistent performance lap after lap

• Hydraulic Bump Stop – Smooth landing at full travel, even on hard impacts

• Dual Oil Circuits – Separate lubrication and damping oils optimize performance without compromise

• High-Quality Materials – 7000 series aluminum cartridge bodies and outer tubes, hard chrome stanchions, and type 3 hard anodized finish for scratch resistance and long-term durability

Fully Adjustable for Every Rider

• Tunable compression, rebound, and spring preload

• Custom spring rates for all rider weights and styles

• External adjusters for easy on-the-fly tuning

• High-tensile lightweight springs maintain performance while reducing weight

Plug-and-Play Installation

• Direct swap for stock Ultra Bee, no modifications required

• Comes with dust seals and headset bearing installed on steerer tube

• Triple clamps and guards fit directly with Ultra Bee fairings and cable routing

Specifications

• Fork Type: Upside-down (USD)

• Travel: 246 mm

• Free Length: 856 mm

• Offset: 25 mm

• Stanchion Diameter: Ø43 mm, chrome-plated steel

• Outer Tubes: Seamless 7050 aluminum, type 3 hard anodized

• Dropouts: Forged 6061 aluminum, type 3 hard anodized

• Triple Clamps: Forged 6061 aluminum, type 3 hard anodized

• Steer Tube: Seamless 7050 aluminum, type 2 anodized

• Damping: Symmetrical closed cartridge with spring-backed IFP

• Rebound: Dual-side high-tensile steel spring, adjustable

• Adjusters: External compression and rebound

• Seals: NBR

• Fork Guards: High-impact PP, 210-degree wraparound

• Weight (including clamps and steerer): 22 lbs / 10 kg

Fitment Notes

• Designed for Surron Ultra Bee

• For guaranteed fitment, Sirris recommends installing the Sirris rear triangle during the shock installation procedure

• Aftermarket triangle links may interfere with the fork or shock. Always check clearance before use to avoid damage or injury

The Sirris F43 Fork delivers ultra-plush travel, precise adjustability, and race-ready performance for riders who demand the best from their Ultra Bee.