Sirris F43 CMX Front Fork – E Ride Pro SR

RIDE IT ONCE. REGRET EVERYTHING ELSE.

The Sirris F43 CMX is the ultimate compact E-Moto fork. Engineered for elite control, razor-sharp handling, and unmatched front-end confidence, this fork combines a race-built F43 chassis with a CMX-tuned closed cartridge damper. It’s the strongest, most durable, and highest-performance front suspension for your E Ride Pro SR.

Precision Engineering for Peak Performance

• CMX-Tuned Closed Cartridge Damper – Optimized for precise damping, improved traction, and unparalleled stability

• Oversized, Race-Built Chassis – Handles extreme forces while maintaining smooth, predictable performance

• Tool-Free Compression Adjusters – Nearly 30 external click adjustments for high- and low-speed compression tuning without a screwdriver

• Direct Mount (DM) Ready Stem – Installs effortlessly with your current stem, no extra parts needed

• Drop Clamp Option – Optional 21” wheel compatibility by raising the front end 25 mm while maintaining 220 mm travel

• Ultra-Stiff Axle & Dropout Assembly – Enhances steering precision and allows caliper/wheel upgrades

Specifications

• Fork Architecture: Upside-down (USD)

• Travel: 220 mm (drop clamp adds +25 mm)

• Free Length: 775 mm

• Fork Spacing: 178 mm (fits wide range of tires)

• Fork Weight: 4 kg per leg

• Stanchions: Ø43 mm, high tensile steel, hard chrome

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

• Dropouts: 6061 aluminum, type 2 anodized, replaceable caliper mount brackets

• Axle: Ultra-high tensile, hard chromed

• Triple Clamps: Billet 6061 aluminum, type 2 anodized

• Steer Tube: Seamless 7050 aluminum, type 2 anodized

• Damping: Symmetrical closed cartridge with spring-backed modified IFP

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

• Adjusters: Tool-free compression; rebound adjusted with tool

• Seals: NOK MX

• Bushings: Daido MX

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

Spring Rate Options

Select the correct CMX tune based on rider weight (without gear, ~15 lbs riding gear included):

• Medium: 140–180 lbs (4.0 / 4.0 left/right)

• Heavy: 180–220 lbs (4.4 / 4.0 left/right)

Note: Fits E Ride Pro SR; also compatible with E Ride Pro SS 3.0 but will feel stiffer due to higher spring rates. Compare spring rates before purchase.

Fitment

• E Ride Pro SR (primary)

• Optional: E Ride Pro SS 3.0 (stiffer)

The Sirris F43 CMX Fork delivers race-level precision, stiffness, and adjustability—perfect for riders seeking the ultimate E-Moto front suspension upgrade.