EXT Arma MX- E-MX Dedicated Damper

The Arma MX represents a total structural redesign. To manage the increased unsprung mass of e-moto swingarms, EXT moved to a solid machined 7075 T6 aluminium head and a 14mm chromed steel shaft—50% larger than most MTB coils. This provides the lateral stiffness required to prevent binding and shaft failure during high-speed MX-style impacts.

E-Moto Specific Kinematics

Standard MTB shocks are valved for 15kg bikes; the Arma MX is valved for the 120lb+ (55kg) reality of e-motos. It features a unique negative spring system inside the cover guiding to improve platform stability and prevent harsh top-outs, which are common on high-torque electric drivetrains.

The EXT Arma MX (E-MX) is a specialised evolution of the Arma platform, purpose-built for the "Lightweight Electric Moto" category. While the standard Arma V4 is a mountain bike shock, the Arma MX is designed specifically to handle the significantly higher vehicle weights and aggressive leverage ratios of e-motos like the Sur-Ron Light Bee, Talaria Sting, and E-Ride Pro SS.

It is the industry benchmark for riders who have found that traditional MTB shocks simply cannot survive the forces generated by a 50kg+ electric motorcycle

CHOOSE SIZE

267x87

Price (select options)

£950.00

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Months	12
Purchase Cost	£950.00
APR	11.90%
Deposit %	10.00%
Deposit amount	£95.00
Loan amount	£855.00
Pay per month	£75.68
Total payable	£1,003.16

THE DETAIL

Key Features

Bespoke Eyelet Design: Uses spherical bearings rather than standard DU bushings to eliminate friction caused by frame flex and swingarm twisting.
Adjustable HBC (Hydraulic Bottom-out Control): Externally adjustable to prevent bottoming out on big "sender" jumps, allowing you to run a plush spring for trail traction without fearing the "clunk."
High Flow 29mm Piston: Redesigned for the higher oil velocities of e-moto usage, ensuring the damping doesn't "choke" during successive high-speed hits.
Low Reservoir Pressure: Operating at just 55 PSI, the shock offers incredible initial sensitivity, making the bike feel "planted" over small-bump chatter.
The Weight Class: The Arma MX is designed for vehicles that weigh 50kg - 70kg. . For most e-MTB riders, the E-Storia remains the better "pedal-friendly" choice.
Spherical Bearings: The use of spherical bearings in the eyelets is a game-changer for durability. If your frame has a history of wearing out shock bushings quickly due to side-loading, the Arma MX's hardware is the permanent fix.
Spring Rates: Because of the vehicle mass, spring rates for the Arma MX usually start at 450lb for lightweight riders and can go up to 650lb for "senders."

SPECIFICATIONS

Specification	Detail	Notes
Application	E-Moto (Sur-Ron, Talaria, E-Ride Pro)	Not intended for standard MTBs.
Chassis	Reinforced 7075 T6 & Chromoly	Solid-milled head for max rigidity.
Shaft Diameter	14mm	Chromed steel with low-friction coating.
Adjustments	4-Way (HSC, LSC, LSR, HBC)	Fully independent hydraulic circuits.
HBC Range	Last 15%�20% of Stroke	Externally adjustable for "bottomless" feel.
Standard Size	267x87mm	Direct bolt-on for Sur-Ron/Talaria.
Spring Type	EXT Superlight V2 (MX Spec)	Available in rates from 400lb to 650lb .
Piston Tech	29mm High Flow / 24mm Valve	Optimized for high-mass vehicles.
Oil Circuit	Turbulent Flow Progressive	Maintains support in the mid-stroke.
UK Price	?�950.00��1,150.00	Custom tuned for rider and bike weight.

Specification	Detail
Application	E-Moto (Sur-Ron, Talaria, E-Ride Pro)
Chassis	Reinforced 7075 T6 & Chromoly
Shaft Diameter	14mm
Adjustments	4-Way (HSC, LSC, LSR, HBC)
HBC Range	Last 15%�20% of Stroke
Standard Size	267x87mm
Spring Type	EXT Superlight V2 (MX Spec)
Piston Tech	29mm High Flow / 24mm Valve
Oil Circuit	Turbulent Flow Progressive
UK Price	?�950.00��1,150.00

Specification	Notes
Application	Not intended for standard MTBs.
Chassis	Solid-milled head for max rigidity.
Shaft Diameter	Chromed steel with low-friction coating.
Adjustments	Fully independent hydraulic circuits.
HBC Range	Externally adjustable for "bottomless" feel.
Standard Size	Direct bolt-on for Sur-Ron/Talaria.
Spring Type	Available in rates from 400lb to 650lb .
Piston Tech	Optimized for high-mass vehicles.
Oil Circuit	Maintains support in the mid-stroke.
UK Price	Custom tuned for rider and bike weight.

Specification
Application
Chassis
Shaft Diameter
Adjustments
HBC Range
Standard Size
Spring Type
Piston Tech
Oil Circuit
UK Price