FERRO USD

EXT Racing Shox is extremely proud to introduce the brand-new FERRO USD 36, an upside-down design suspension fork featuring 36mm stanchions to complete their E-MX line-up. The Hard heat-treated chrome moly steel stanchions (W/Superfinish surface treatment), 7000 series aluminum constructed upper legs utilizing a 205mm travel design with a dedicated triple clamp, comprise the core of the Ferro, developed for minimum friction and high stiffness.

FEATURES:

• Robust dual crown inverted MX design (USD)
• 36mm Ø hard chromed steel stanchions (heat treated 42CrMo4) with Superfinish surface treatment
• HS3 3- twin positive air system ¬+ 1 large negative self-balancing air chamber, allows for an optimum level of support through all the travel

• High flow 3-way cartridge damper system with independent high & low speed compression plus 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 and low hysteresis
• Self-hydraulic cartridge bleeding
• Dedicated Mobile Sliding DU guiding system with super-long static overlap (for maximum guidance
• and best torsional rigidity). (CGB Continuously Guided Bushing system, increase 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 after market wheel sets.

HS3 TECHNOLOGY

The FERRO USD 36 fork utilizes our HS3 technology, a unique hybrid air spring system that operates in the same fashion as the already renowned ERA V2 MTB fork as well as other high end Moto options. The two separate positive air chambers work in tandem with a high volume self-equalizing negative air chamber to provide unparalleled mid-stroke support around the dynamic sag position while simultaneously offering amazing sensitivity and bottom-out protection.

3 WAY-ADJUSTABILITY

A high-flow 3-way adjustable hydraulic damper cartridge featuring an independent High/Low speed compression and Rebound adjustments sets the new standard in fork adjustability. This allows each rider to properly adjust the damping forces according to their individual riding style and weight. The possibilities to tailor the fork on your preferences have become unlimited.

SLIDING BUSHINGS

We evaluated every aspect of the bushing design to provide a low friction solution to improve smoothness and sensitivity while maintaining structural rigidity. This process took us back to our 14 World Rally Championship wins, that made EXT the most successful suspension manufacturer in WRC.

Our new DU bushing material used in the FERRO USD 36 fork is sized to defined tolerances for each fork assembly to work in harmony with our dedicated EXT oil. This guarantees zero stiction and super low dynamic friction properties even when combined with high side loads. The dedicated DU guiding system made with a specific superlong bushing overlap ensures the maximum guidance and the best torsional rigidity characteristics of the stanchions. (We’ve called it, CGB, Continuously Guided Bushing system which also helps to increase the dynamic stiffness). Perfect alignment and excellent sliding are guaranteed by the wheel axle with double hexagonal head. This shape, associated with the double crown in 7075 aluminum, ensures maximum torsional rigidity.

NEW HIGH-FLOW CARTRIDGE

The new FERRO USD 36 inherits the best technologies from our well-known ERA V2 and it optimizes them for the E-MX application by adopting an innovative radial floating shaft guide in the damper cartridge with a Superfinish surface treatment and new aeronautical seals, which takes the friction to the lowest possible level. EXT high-volume cartridge uses a high flow piston to generate control for your bike, an essential performance upgrade for spirited riding.

This large piston design provides the best damping control possible. The cartridge is also equipped with a bump valve design (HDRV –High Dynamic Response Valve) with 2 different shim stacks for mid and high speed and an Internal Floating Piston (IFP) guided and combined with a bespoke thrust bearing to enhance fast response and guidance. Our goal has always been to find a balance between all the internal cartridge pressures, and through a long development process we made possible the optimization of the internal forces reaching low values of hysteresis and no cavitation.

* Available in Drop or Flat Crown !!