EXT Ferro E-MX Fork Suspension Upgrade: Sur-Ron, Talaria, E Ride Pro

The EXT Ferro E-MX Fork is among the most premium front suspension upgrades for Sur-Ron, Segway, Talaria, E Ride Pro, and other electric motorbikes at Darwin EV. Developed for minimum friction and high stiffness, the Ferro USD 36 features an upside-down, 36mm stanchions fork. Equipped with chrome-moly steel stanchions, 205mm travel design, and a dedicated triple clamp, the EXT Ferro E-MX Fork will surely boost your performance.

EXT Ferro E-MX Fork Features

• Fits Sur-Ron Light Bee, Segway X260, Talaria Sting / X3, E Ride Pro 2.0/3.0, Ventus One, 79Bike, Rawrr Mantis/X, Zero XB, ReRode, Altis Sigma (see Compatibility Chart below)
• Dual crown inverted MX design (USD)
• 36mm hard-chromed steel stanchions (heat-treated 42CrMo4) with Superfinish surface treatment
• HS3 3-twin positive air system + 1 large negative self-balancing air chamber = optimum support for all travel
• High-flow, 3-way adjustable cartridge damper system with independent high/low speed compression + rebound damping adjustment
• Superfinish inner tube coating
• External pressure air release system on both legs
• Twin hexagonal floating axle, boost compatible 20mm
• Air spring and cartridge radial guide system with bespoke aeronautical seals (minimize friction on side loads)
• Large piston design for best damping control and separate IFP/coil energized compression valve
• No cavitation + low hysteresis
• Self-hydraulic cartridge bleeding
• Dedicated Mobile Sliding DU guiding system with super-long static overlap for maximum guidance and best torsional rigidity
• Continuously Guided Bushing (CGB) system increases dynamic stiffness
• 205 mm of travel and 44 mm offset
• 200 mm post mount brake
• Weight: 4000gr
• Pressure release one-way valves on both legs
• Compatible with stock fender design
• Boost Hub Spacing for more flexibility with aftermarket wheel sets

NOTE:  If you are running a stock wheel or a wheel that is not specifically designed for use with BOOST hubs, you will need to install a rotor adapter (option available).  

EXT Ferro E-MX Fork Compatibility
Make	Model	Direct Fit?	Notes
Sur-Ron	LBX	Yes w/ Boost Rotor Spacer	All model years compatible
Talaria	MX3/MX4	Yes w/ Boost Rotor Spacer	Recommended: Drop Crown for MX / Flat for X3
	X3
	MX5	No	MX5 version available soon
E Ride Pro	S/SS/2.0	Yes w/ Boost Rotor Spacer	N/A
	3.0/SR	Yes w/ EXT Brake Adapter	Fits SR model, but will not be covered by warranty.
Ventus One/One+	N/A	Yes w/ Boost Rotor Spacer	N/A
79Bike	N/A	Yes w/ Boost Rotor Spacer	N/A
Rawrr	Mantis/X	Yes w/ Boost Rotor Spacer	N/A
Zero	XB	Yes w/ Boost Rotor Spacer	N/A
ReRode	R1 / EWatt 2.0	Yes w/ Boost Rotor Spacer	N/A
Altis Sigma	N/A	Yes w/ Boost Rotor Spacer	N/A

EXT Ferro USD 36 Fork Technology

HS3 is a unique hybrid air spring system focused on mid-stroke support in dynamic sag position while offering excellent sensitivity and bottom-out protection. Using two separate positive air chambers, HS3 technology works with one high-volume, self-equalizing, negative air chamber.

The goal is to find a balance between all the internal cartridge pressures. Made possible by EXT's optimization of internal forces, the Ferro E-MX Fork reaches low values of hysteresis and no cavitation.

Paired with the industry-leading EXT Arma MX shock damper, known for its reliability and performance, you can have one of the best upgrade suspension packages on the market to boost the performance of your electric dirt bike.

EXT Ferro E-MX Fork Structure

Dual Crown Structure:  The robust double crown design in 7075 aluminum ensures maximum stiffness. Crown design is compatible with stock fender designs.

Sliding Bushings:  This low-friction solution enhances both smoothness and sensitivity. The dedicated DU guiding system is made with an extra-long bushing overlap to ensure optimal guidance and torsional rigidity of the stanchions. This Continuously Guided Bushing (CGB) system also helps to increase dynamic stiffness.

Wheel Axle:  Twin hexagonal-head, floating wheel axle guarantees perfect wheel alignment while assuring maximum torsional rigidity.

High-Flow Damper Cartridge:  The EXT Ferro Fork inherits the best technologies from ERA V2 and adopts a radial floating shaft guide in the damper cartridge. The Superfinish surface treatment uses aeronautical seals for minimal friction. EXT's high-volume cartridge uses a high flow piston to generate control for your bike, an important performance upgrade for riding. The large piston design allows the best damping control.

The Ferro USD 36 damper cartridge is also equipped with a bump valve design (HDRV – High Dynamic Response Valve). Additionally, two different shim stacks (mid/high speed) and an Internal Floating Piston (IFP) are combined with a bespoke thrust bearing to enhance fast response and guidance.

3-Way Adjustable:  The high-flow hydraulic damper cartridge features independent High/Low speed compression and rebound adjustments. This allows you to properly adjust the damping forces according to your individual riding style and weight.