EXT Racing Parts

EXT Racing (Extreme Racing Shox) is an elite Italian suspension manufacturer based in Vicenza, Italy, renowned worldwide for championship-level engineering across Formula 1, World Rally Championship (WRC), and elite downhill mountain bike racing. Recognizing that lightweight electric dirt bikes occupy a unique weight and dynamics category between downhill bicycles and full-size motocross motorcycles, EXT engineered dedicated suspension systems built to handle the rigorous demands of high-speed e-moto riding. Their flagship ERA fork cartridge kit delivers unmatched mid-stroke support, zero cavitation, and plush bump absorption.

Based in Vicenza, Italy, EXT has spent decades at the absolute pinnacle of motorsport damping technology. When lightweight electric dirt bikes like the Sur-Ron gained popularity, most riders were forced to rely on downhill mountain bike forks. However, downhill bike forks were designed for a 15 kg bicycle and an 80 kg rider; when mounted on a 50+ kg electric motorcycle traveling at high speed, standard mountain bike forks suffer from excessive chassis pitch, violent brake dive, and oil foaming (cavitation). EXT solved this fundamental physics problem by developing the ERA hydraulic cartridge system. Featuring high-flow piston architecture, proprietary low-friction seals, and a unique HS3 hybrid air/hydraulic spring system, EXT cartridges eliminate harsh bottoming out while providing active mid-stroke support that keeps the bike level through steep berms, braking bumps, and rock gardens. Every EXT product is hand-assembled in Italy, dynamometer-tested, and custom-valved for the specific weight distribution and leverage curves of electric dirt bikes.

We proudly feature the **EXT Racing ERA Fork Cartridge Kit** (SKU: SR-EXT-0010):

- **What It Replaces**: Completely replaces the factory damping and spring internals inside your existing fork stanchions with Italian-engineered closed-cartridge damping technology. - **What It Changes About the Bike**: Eliminates brake dive, provides independent high-speed and low-speed compression adjustment, prevents bottoming out on hard jump landings, and keeps the front tire glued to the terrain for maximum cornering traction. - **Anti-Cavitation Technology**: Features a pressurized internal reservoir that prevents oil foaming during prolonged, rapid suspension cycling over rough terrain.

Suspension is the single biggest factor governing how fast and safely an electric dirt bike can be ridden off-road:

- **Aggressive Enduro & Singletrack Riders**: If you ride rocky, root-strewn mountain terrain, EXT damping isolates your hands and wrists from harsh impacts, dramatically reducing arm pump and fatigue. - **High-Speed Freeriders & Jumpers**: Riders landing large jumps or drop-offs need the progressive hydraulic bottom-out control of the EXT cartridge to prevent harsh bottoming that damages wheels and forks. - **Riders Seeking Motorcycle-Grade Damping**: If you are frustrated by the constant pogo-stick feel, flex, and unpredictable damping of stock factory forks, EXT delivers authentic race-car-grade hydraulic control.

Suspension is a critical safety system on a high-speed vehicle. Professional installation by an experienced motorcycle or suspension technician is strongly recommended:

1. **Stanchion Compatibility**: Ensure your fork stanchion internal diameter matches the exact cartridge specification before ordering. 2. **Oil Bleeding**: The cartridge must be filled with EXT's high-viscosity-index racing fluid and meticulously vacuum-bled to ensure zero air bubbles in the damping chamber. 3. **Sag & Preload Setting**: Set rider sag to approximately 20% to 25% of total travel with the rider in full gear in the standing attack position before fine-tuning clicker adjustments.