EXT Ferro Fork + Arma Shock E-Moto Suspension Set

The EXT Ferro Fork and Arma Shock are among the most premium suspension upgrades for lightweight electric dirt bikes including Surron, Talaria, E Ride Pro, and more. Known for their reliability, performance, and customization, upgrade your ride confidently with the industry-leading e-moto suspension package.

EXT E-Moto Suspension Compatibility

• Surron Light Bee X/S
• Segway X160/X260
• Talaria Sting MX3/MX4/MX5
• Talaria X3
• E Ride Pro S / SS 2.0 / SS 3.0 / SR
• Ventus One
• 79Bike Falcon
• Altis Sigma

See EXT Ferro Fork compatibility chart below.

EXT Ferro E-MX Fork Features

• Dual drop 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
• Choose Warp 9 Boost Hub Spacer 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 the Warp 9 Boost Hub Spacer (add-on option available).

Note: For older Surron Light Bee models, a head tube reinforcement clamp is recommended.

EXT Ferro Fork Compatibility
Make	Model	Direct Fit?	Notes
Surron	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 Arma E-MX Shock Features

• Fully-Customizable Hydraulic Setup: specific for each rider / bike
• Lightweight Spring Options: 400/450/500/550/600 lbs (lower weight available upon request)
• Full Length and Travel: 10.5" x 3.5" shock - don't use with 1.5″ riser linkage
• 4-way Adjustable Hydraulic Bottom-Out Control: LSC-HSC-LSR-HBC
• Easy Installation: direct, bolt-in, no additional hardware needed
• Dedicated Eyelet Design: spherical bearing on both ends
• Main Piston: high-flow 29mm / Valve Piston: 24mm
• Shaft: 14mm - 50% larger than most coils for handling large side-loading events
• Rebound Circuit: engineered to separate bump and rebound oil flow (ultra-low friction coating)
• Very Low Reservoir Pressure: maximum sensitivity and low cavitation (55 PSI)
• Very Low Hysteresis:  high dynamic response
• High Turbulent Flow for progressive dampening + mid stroke support
• Low-Friction Seal
• Thin Bottom-Out Bumper
• Washer for clearing debris
• Low-Profile Rebound Knob for easy spring swap
• Includes (1) lightweight spring available in 400, 450, 500, 550, or 600 lbs
• Includes mounting hardware for easy bolt-in installation
  

Arma Spring Size Guide
Rider Weight	Spring Size
Up to 140 lbs	400
140-180 lbs	450
180-210 lbs	500
210-240 lbs	550
240+ lbs	600

Note: This chart is a general guide for choosing your spring size. For firmer or softer preference, select a spring weight size above or below. For the maximum weight limit, please refer to the Sur-Ron, Segway, or Talaria manufacturers guidance.