JBI Suspension WP48 / XACT48 Pro Fork Revalve Setup
WP AER48 Fork (KTM, Husqvarna, & GasGas motocross & off-road models)
Also known and rebranded as the WP XACT AER48
Bike fitment chart at bottom of page

The JBI Suspension WP AER48 / XACT48 Pro Fork features internal JBI Suspension valving mods matched with select hardware upgrades to get the most performance out of the WP AER48 / WP XACT AER48 Fork for Motocross, Enduro, Off-Road, Arenacross, FMX, and Free Riding. 

Incorporating the JBI Suspension WP AER48 / XACT48 Pro Fork Kit allows for running less air pressure in the fork without the fork being overly soft.  The improved damping efficiency of the fork along with lower air pressure results in a big improvement in fork comfort, feel, and sensitivity over small/medium size bumps.  This feeling is often described as fork "plushness".

Click on each bullet point for more details...

• JBI Suspension Fork Revalve
• JBI Suspension WP AER48 / XACT48 Pro Fork Kit
• JBI Suspension Fork Oil
• Suspension valving shims & hardware
• Additional wear items not included
• JBI Pro Coatings available
• Now available as a Do It Yourself Install Kit

What is a "subvalve" or also know as "low speed valve?"
A subvalve more effectively meters the oil flow thru the bypass circuit of a compression valve assembly.  Most often the oil flowing thru the bypass circuit is only controlled/adjusted by changing the setting of the compression clicker.  While the compression clicker functions well in altering the total volume of oil that can flow thru the bypass circuit, there is still room for improving how to control/manage the oil flow (pressure) thru the bypass circuit.  A subvalve adds the ability to control the flow of oil thru the bypass circuit with suspension shims AND the clicker adjuster.  With the addition of shims, the oil is no longer able to freely flow thru the bypass circuit without light initial resistance.  This light initial resistance is key as it allows for more effective control of the fork compression damping system thru the entire suspension travel at all speeds/pressures.  That is why it is possible to run less air pressure in the WP AER48 fork without it being overly soft.   Subvalves (aka low speed valves) are common in high end A-Kit forks and all production KYB SSS forks. 

JBI Suspension WP AER48 (also the WP XACT AER48) Bike Fitment Chart

KTM
2017-2022/2025 KTM 150 SX
2017-2025 KTM 150 XC
2017-2025 KTM 250 SX
2017-2025 KTM 250 XC
2017-2025 KTM 300 XC
2017-2025 KTM 250 SX-F
2017-2025 KTM 250 XC-F
2017-2025 KTM 350 SX-F
2017-2025 KTM 350 XC-F
2017-2025 KTM 450 SX-F
2017-2025 KTM 450 XC-F

Husqvarna
2017-2025 Husqvarna TC 125
2017-2025 Husqvarna TC 250
2017-2025 Husqvarna TX 300
2017-2025 Husqvarna FC 250
2017-2025 Husqvarna FX 250
2017-2025 Husqvarna FC 250
2017-2025 Husqvarna FX 250
2017-2025 Husqvarna FC 350
2017-2025 Husqvarna FC 450
2017-2025 Husqvarna FX 450

GasGas
2021-2025 GasGas MC 125
2025 GasGas MC 150
2021-2025 GasGas MC 250
2021-2025 GasGas MC 250F
2025 GasGas MC 300
2022-2025 GasGas MC 350F
2021-2025 GasGas MC 450F

To order call 480-269-5585 or email JBI@RideJBI.com

VitalMX 2020 KTM 350SXF with JBI Suspension WP AER48 Pro Fork review tested by David Pingree.

JBI Suspension WP AER48 Pro Fork Off-Road testing with 2020 AMRA Open A Champion Travis Azure

8.26.24

Motocross | Off-Road | WORCS | Enduro | Free Riding | Arenacross | Freestyle Moto