The EXT Ferro EMX Lightweight Air Fork is a dual-crown inverted suspension fork for electric off-road bikes with long-travel front ends, made by EXT and sold here at GritShift. It pairs 36 mm heat-treated chromoly stanchions with 205 mm of travel, the HS3 hybrid air spring and a three-way adjustable cartridge damper, and weighs 9 lb.
Specs verified October 2026 against the live GritShift product page.
Specifications
| Fork type | Dual-crown inverted air fork for long-travel electric off-road platforms |
|---|---|
| Stanchions | 36 mm upside-down, heat-treated chromoly steel inner tubes |
| Travel | 205 mm |
| Weight | 9 lb |
| Upper construction | 7000-series aluminum |
| Spring | HS3 hybrid air spring: twin positive chambers and a self-balancing negative chamber |
| Damper | High-flow cartridge; independent high-speed compression, low-speed compression and rebound |
| Axle | Floating axle system |
| Bushings | Long-overlap DU bushing guidance |
| Pressure relief | Pressure-release valves |
| Included | Drop crown configuration for larger front wheel setups and adjusted front-end geometry |
| Brake mount | MTB style 74 mm post mount; a rotor boost spacer may be needed depending on the front wheel configuration |
| Rider weight options | Four spring settings from 130 lb to 205 lb |
What bikes does the EXT Ferro EMX fork fit?
- Universal: any e-moto with an MTB style brake system on a 74 mm post mount (verify before ordering)
Why an air fork with the HS3 spring on an e-moto?
EXT designed the Ferro around its HS3 air spring and cartridge damping to replace a stock front fork with a high-stiffness, adjustable assembly for aggressive trail and technical riding. The HS3 hybrid air spring combines twin positive chambers with a self-balancing negative chamber, which improves mid-stroke support and bottom-out control while keeping the fork sensitive across the usable 205 mm of travel. The result EXT is after is better front-end control and stability across varied terrain.
How much damping adjustment does the Ferro give?
The high-flow cartridge damper offers independent high-speed compression, low-speed compression and rebound adjustment, so the fork response can be tuned for terrain and riding style rather than left at a factory setting. It is ordered by rider weight in four settings that run from 130 lb to 205 lb, so the air spring starts in the right range before any clicks are turned.
What keeps the 36 mm inverted chassis tracking straight?
The 36 mm upside-down stanchion structure uses heat-treated chromoly steel inner tubes and 7000-series aluminum upper construction to balance torsional rigidity against reduced friction through the stroke. A floating axle system and long-overlap DU bushing guidance support consistent alignment and reduce binding under load, and pressure-release valves help the fork stay predictable through repeated impacts.
Does the Ferro fit my bike and brakes?
EXT lists the Ferro as universal for e-motos that use an MTB style brake system on a 74 mm post mount, so check your caliper mount before ordering. A drop crown configuration is included for larger front wheel setups and adjusted front-end geometry, and depending on your front wheel configuration you may need to install a rotor boost spacer.
Where can I buy the EXT Ferro EMX Lightweight Air Fork?
Right here. We sell the EXT Ferro EMX Lightweight Air Fork at GritShift, made by EXT. Browse every fork and shock we carry in our Forks & Shocks collection.
