Dedicated E-Moto Chassis
The USD36 platform combines hard-chromed steel stanchions with machined 7000-series aluminium upper clamps for high stiffness under demanding E-Moto loads.
EXT REA-MX | E-Moto Shock
$2,695.00
/
Couldn't load pickup availability
EXT REA-MX is a dedicated E-Moto damper for larger electric dirt bikes such as the Sur-Ron Ultra Bee. Its 40 mm piston, 16 mm shaft and large reservoir are designed to provide high flow, low friction and extensive tuning capability.
KEY FEATURES
- 320 x 87 mm fitment for Sur-Ron Ultra Bee
- 40 mm piston and 16 mm shaft
- Four-way adjustment: high-speed compression, low-speed compression, HBC and rebound
- High-flow piston design
- High-load spherical bearings
- Large low-pressure reservoir
- Externally adjustable Hydraulic Bottom-Out Control
- Low-friction seals and low-hysteresis pressure balance
- Spring sold separately
FIND IT IN NEARBY STORE
FIND IT IN NEARBY STORE
Customers Also Bought
EXT FERRO USD36
BUILT FOR E-MOTO.
READY FOR MORE.
Best Suited To
Electric dirt-bike and E-MX riders needing a stiff, low-friction
inverted fork with progressive air-spring control and 200 mm travel.
Stanchions
36 mm
Hard-chromed steel construction
Travel
200 mm
Dedicated E-Moto travel
Axle
20 mm
Floating Boost-compatible axle
Spring
HS3
Progressive multi-chamber air spring
Why Choose the Ferro?
High-Stiffness Control for Electric Dirt Bikes
Progressive HS3 Spring
The twin-positive HS3 air system adds progressive support through the stroke, allowing lower chamber pressures for traction without sacrificing bottom-out resistance.
Independent Damper Control
A high-flow three-way cartridge provides separate high-speed compression, low-speed compression and rebound adjustment.
Technical Information
Detailed Specs
Product specifications, setup details and service information for the EXT Ferro USD36 E-Moto fork.
Fitment and Geometry
Product Platform
USD E-Moto suspension fork
Intended Use
Electric dirt bikes and E-MX applications
Approved Vehicle Power
Up to 7 kW
Available Travel
200 mm
Fork Offset
45 mm
Crown Options
Flat crown or drop crown
Crown Spacing
177–221 mm total distance between crowns
Wheel Axle
20 mm Boost-compatible floating axle
Spring and Damper
Spring System
HS3 hybrid air-spring system
Air Chambers
Twin positive chambers with one large self-balancing negative chamber
Main Chamber
Black valve marked “+”
Secondary Chamber
Nickel-coloured valve marked “++”
Starting Pressure
+ 65 psi / ++ 100 psi
Inflation Order
Inflate ++ first, then +
Maximum Pressure
300 psi / 20.6 bar
Damper Cartridge
High-flow three-way adjustable cartridge
External Adjustments
High-speed compression / Low-speed compression / Rebound
Compression Valve
Separate IFP and coil-energised compression-valve design
Hydraulic Performance
No cavitation and low hysteresis
Cartridge Bleeding
Self-hydraulic cartridge bleeding
Chassis and Construction
Stanchion Diameter
36 mm
Stanchion Material
Heat-treated 42CrMo4 steel
Stanchion Finish
Hard chrome with Superfinish surface treatment
Upper Clamps
Dedicated triple-clamp design machined from 7000-series aluminium
Air-Spring Shaft
Chromed steel shaft with Superfinish surface treatment
Pressure Release
External pressure-release valves on both legs
Radial Guidance
Air spring and cartridge radial-guide system
Sealing System
Bespoke aeronautical seals designed to reduce dynamic friction
Bushing System
Mobile Sliding DU and CGB continuously guided bushing system
Bushing Overlap
Super-long static overlap for guidance and torsional rigidity
Axle Design
Twin hexagonal floating axle
Axle Benefit
Designed for maximum torsional rigidity at the axle assembly
Setup and Service
Racing Service Interval
Every 50 riding hours or 6 months
Recreational Service Interval
Every 100 riding hours or 1 year
Outer-Leg Oil
20 ml EXT EV68S in each outer leg
Axle Torque
10–14 Nm
Pinch-Bolt Torque
8 Nm
Crown Torque
6 Nm
Installation
Installation by a qualified mechanic is recommended
Approved Components
Use original EXT Racing Shox parts only
Before-Ride Inspection
Inspect for cracks, leakage, damage or visible defects
High Rider Weight
Riders above 90 kg should inspect the fork more frequently
Support
Manuals and Official Resources
EXT Fiveplus Warranty Program
5 Year Warranty
From 1 January 2025, EXT’s current MTB and E-MX product range is eligible for the Fiveplus program. It adds three years of additional coverage to the original two-year legal warranty. Registration must be completed within 30 days of purchase, and a yearly full maintenance service is required to keep the extended coverage valid.