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By EXT

EXT Ferro USD 36 Fork

Starting at 2439.00 

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Details

The EXT Ferro Fork brings performance to a new level. It sets a new standard by bringing full size dirt bike suspension technology to the world of light e-dirt bikes.

Engineered from the ground up for light dirt bikes such as the Sur Ron Light Bee and Talaria Sting, the EXT brings unparalleled performance. Quentin won the FIM E-Enduro World Cup with the Ferro, so no doubt it’s up to the task.

Available with a Drop Crown for 21″ wheel or Flat Crown for 19″ and less.

Shipping and returns

We ship worldwide (batteries are limited to Europe). Products indicated as being in stock are shipped in less than 72 hours after you place the order. Our warehouse is located in France, so transport cost and time may vary depending on the delivery country.

Changing one’s mind is human. That’s why you have up to 30 days after the delivery of your order for a return. Just let us know and we will take care of all the details.

Payments

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We offer different payment methods to accommodate your preferences: Credit Cards, PayPal, Wire Transfer & Klarna.

Your order is automatically validated as soon as the payment is confirmed. In case of a return, your refund goes to the payment method used for the order.

Upper Crown Type

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Description

The EXT Ferro is a real breakthrough in the dirt e-bike world. It’s the very first suspension designed and engineered from the ground up for the needs of our light electric dirt bikes. This inverted style fork brings our Talaria, Sur Ron and others like the Drill One to new heights of performance.

In a word, this is by far the very best performing fork on the market. It has in-class lateral stiffness, offers the best sensitivity on small bumps all the while allowing to seperately tune your end of stroke with the dedicated secondary air chamber.

Chassis

Entirely designed and manufactured in Italy, the Ferro is an upside down moto style fork with a 7075 aluminium body and 36mm hard chromed steel stanchions with 200mm of travel.

The heat-treated stanchions feature a Superfinish surface treatment, allowing the most sensitive damping while offering an unrivaled stiffness, putting many full size forks to shame.

EXT uses CGB (Continuously Guided Bushing) and Dedicated Mobile Sliding DU guiding system to increase stiffness. Radial rigidity at the wheel is taken care of by using a Twin hexagonal floating axle.

As it was designed with our e-motos in mind, the Ferro USD 36 is fully compatible with the Light Bee and Talaria sting’s factory fenders.

Air Spring System

The secret behind the Ferro’s performance is the patented HS3 technology. The EXT hybrid air spring system uses two positive air chambers:

This twin positive air system, along with the high volume self-equalizing negative air chamber, provides unparalleled mid-stroke support while simultaneously offering amazing sensitivity and bottom-out protection.

Hydraulic Cartridge

The high flow hydraulic cartridge offers adjustments in 3 ways: high & low speed compression and rebound adjustments.

The EXT bespoke cartridge features a high dynamic response valve (HDRV), incorporating two distinct shim stacks for optimum mid-speed and high-speed behaviour.

What’s included

Technical details

Travel 200mm
Compatibility compatible with 19″ & 21″ moto wheels with respectively flat and drop crown
Body dedicated design triple clamp uppers machined from 7075 aluminium
Stanchions 36 mm heat-treated chromed steel (42CrMo4) stanchions with Superfinish surface treatment
Rake 45 mm
Axle twin hexagonal floating axle (boost compatible)
Steerer 1.125″ (1″1/8)
Disc compatibility standard 200 mm PM compatible up to 230 mm
Weight 4,5kg (9.9 lbs)

Install & Settings

For install, torque values and maintenance, please refer to EXT user manual or the quick manual.

EXT recommends 65 PSI in the + chamber and 100 PSI in the ++ as a baseline. Quentin weights about 50kg (110lbs) and found out these values to be largely too soft for correct support and feeling.

After careful testing and extended riding, both in enduro and on the track, we recommend 100+ / 200++ as a baseline for an average weight rider. You’ll want to start with both rebound, HSC and LSC tuned at the middle and adjust from there based on your own feeling on the terrain.

The + chamber defines the main behaviour and the SAG. Start by adjusting the SAG: it needs to be in the range of 25 to 40mm and then adjust based on your liking and the feeling of sensitivity and terrain feedback you need.

Once settled, increase the ++ to get the support level you need. The higher the pressure in the ++, the more support you get in the second half of the stroke and the steepest the damping curve.

Once you’ve more or less found your working pressures, start adjusting the rebound, HSC and LSC to fully match your needs.

NB: Please note that the pressure in the ++ chamber is to be higher than in the + chamber at all times and that the max pressure for both chambers is 300 PSI.

Rider’s questions

1 - 2 of 2 questions

Is the fork suitable for heavy riders? I weigh 115 kg with clothes and backpack. I'm a little worried about the air pressure. 1 answer

Volker

Quentin mto logo

The fork can go up to 300PSI of pressure in both chambers so it should be up to the task.

Flat crown is good for 21”? what is the fork length? 1 answer

Mateusz

Quentin mto logo

Unless you have an integrated upper bearing flat down won't do it for the 21". With the bearing it fits at the mm on the LB.

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