Sirris F43 CMX Front Fork for Surron LBX | E Ride Pro S / SS 2.0

Fits: Sur-Ron Light Bee X (2019–2025), Sur-Ron Light Bee S, E-Ride Pro S, E-Ride Pro SS 2.0

Before you order: Sur-Ron Light Bee X

• The stock LBX front rotor is 200 mm. This fork is sized for 220 mm rotors, so the rotor needs to be upgraded. The 220 mm rotor brake bracket is included.
• Sur-Ron LBX wheel spacers are included.
• The stock LBX stem is not compatible because the Sirris steerer tube cannot be clamped. You need a 4-bolt direct-mount stem; message us and we will match one.

The Sirris F43 pairs an oversized 43 mm chassis with the CMX (Compact Motocross) tuned closed-cartridge damper. Tool-free compression adjusters give nearly 30 clicks of quick external adjustment, and the direct-mount crown bolts to a 4-bolt direct-mount stem.

Spring rate

Pick the range that matches your weight. Sirris tunes the Sur-Ron Light Bee X fork in two ranges (rider weight without gear; 15 lb of riding gear is already built in). Rates are left/right.

• Medium, 140–180 lb: 3.6/3.2 springs
• Heavy, 180–220 lb: 3.6/3.6 springs

Drop clamp option: raises the front 25 mm for a 21 in wheel while keeping 220 mm travel. Raising the front keeps the bike balanced when paired with a longer shock that raises the rear.

Fork specs

• Architecture: Upside-down fork
• Travel: 220 mm
• Free length: 775 mm (the drop clamp adds another 25 mm)
• Fork spacing: 178 mm, for unlimited tire choice (dirt or street)
• Fork weight: 4 kg per leg
• Stanchions: Ø43 high-tensile steel with hard chrome
• Outer tubes: Seamless 7050 aluminum, type 3 hard anodized
• Drop outs: 6061 aluminum, type 2 anodized; replaceable caliper mount brackets allow caliper and wheel upgrades
• Axle: Custom race-grade ultra-high-tensile hard-chromed axle
• Top cap: Moto-style top cap for more consistent steering bearing tension
• Triple clamps: Billet 6061 aluminum, type 2 anodized, black or blue; the drop clamp is black only
• Steer tube: Seamless 7050 aluminum, type 2 anodized
• Damping: Symmetrical, adjustable closed cartridge with spring-backed modified IFP
• Damper bodies: Seamless 7050 aluminum, type 3 hard anodized
• Rebound: Dual-side high-tensile steel spring, adjustable
• Adjusters: External tool-free compression; rebound adjusted with a tool
• Seals / bushings: NOK MX seals, Daido MX bushings
• Guards: High-impact PP, 210-degree wraparound

Genuine part. Message us to confirm fitment before it ships.