Sirris F43 CMX Front Fork | Surron LBX & E Ride Pro

RIDE IT ONCE. REGRET EVERYTHING ELSE.

The Sirris F43 CMX is built for riders pushing their bikes beyond stock limitations. Combining an oversized race-spec 43mm chassis with a CMX-tuned closed cartridge damper, this fork delivers unmatched front-end precision, control, and durability for serious e-moto riders.

Designed specifically for lightweight high-power platforms like the Sur-Ron Light Bee X and E Ride Pro SS 2.0, the F43 CMX offers elite suspension performance with exceptional steering precision, improved stability, and confidence at speed.

Key Features

CMX Closed Cartridge System

Race-developed closed cartridge damping system with exceptional front-end control, improved consistency, and precise tuning response.

Tool-Free Compression Adjusters

Nearly 30 clicks of external compression adjustment without needing tools, allowing fast tuning on the fly.

Direct Mount Stem Compatible

DM-ready upper clamp design allows direct compatibility with most existing direct mount stem setups.

Oversized 43mm Chassis

Built with high-tensile steel stanchions and oversized architecture for superior stiffness and front-end feedback.

Optional Drop Clamp Configuration

Optional drop clamp setup raises front-end height by 25mm to properly balance 21” wheel conversions while retaining full 220mm travel.

Ultra-Stiff Axle & Brake Mount System

Redesigned axle and dropout assembly improves steering precision and braking stability while supporting caliper upgrades.

Fitment

Compatible with:

• Sur-Ron Light Bee X
• Sur-Ron Light Bee S
• E Ride Pro S
• E Ride Pro SS 2.0

Spring Rate Options

Medium Spring Setup

• Rider Weight: 140–180 lbs
• Spring Rates: 3.6 / 3.2

Heavy Spring Setup

• Rider Weight: 180–220 lbs
• Spring Rates: 3.6 / 3.6

Weight ranges are based on rider weight without gear. Approximately 15 lbs of riding gear is factored into setup recommendations.

Fork Specifications

Performance Benefits

The F43 CMX delivers exceptional front-end confidence under aggressive riding conditions. Riders can expect:

• Increased steering precision
• Improved high-speed stability
• Better bottom-out resistance
• More predictable damping response
• Enhanced front tire feedback
• Superior durability under heavy riding loads

Whether riding motocross tracks, technical terrain, or urban setups, the F43 CMX is engineered to outperform traditional e-moto suspension systems.

Important Notes

• Some fork options may require additional lead time or pre-order fulfillment
• Optional drop clamp is recommended for 21” wheel setups
• Triple clamp colors available in Black or Blue
• Drop clamp option available in Black only
• Professional suspension installation recommended
• Installation Guide:  Sirris F43 CMX Installation Guide