AER48 KTM / Husqvarna / GASGAS Air to Spring Conversion Kit

KTM / Husqvarna / GASGAS Air to Spring Conversion Kit – WP AER 48

(For full-size bikes fitted with WP AER 48 mm air forks)

Ditch the air and enjoy a more predictable front-end feel. Our Air to Spring Conversion Kit replaces the air spring in your WP AER 48 forks with a coil spring for consistent performance, improved corner-entry feel and greater comfort on longer rides.

Spend less time checking air pressure and more time riding, with external spring preload adjustment to fine-tune your setup.

• Converts your existing WP AER 48 air fork to coil spring.
• Eliminates air spring pressure checks and adjustments.
• Promotes consistent front-end feel throughout your ride.
• Externally adjustable spring preload using a 22 mm hex on the top cap—no disassembly required.

Fitment: Full-size KTM SX, SX-F, XC and XC-F; Husqvarna TC, FC, TX and FX; and GASGAS models equipped with original WP AER 48 mm air forks.

Install Video:

Our WP Air to spring conversion kit is a complete replacement cartridge assembly for your current WP AER setup.  It is designed to completely remove all the Air system from your current WP AER 48 fork  and replace it with a preload adjustable spring and cartridge setup.  High Quality German Engineered ‘Eibach’ Springs are available to suit varying rider weights.  Please advise upon order which spring you require (see recommendations below) or let us know your weight and speed  and we will recommend the best spring for you.  

This kit fit's in minutes.  If you can pull down and service your fork seals on the WP AER 48 fork you can install this kit. Info and instruction included.

Spring Rate Recommendation 

 250F and 2 Strokes 

450F 

General riding & Motocross applications

These recommendations  are a guide only as fork Springs are weight and speed dependent. For example a 72 kg Pro rider falls into the 0.88kg/mm category but may well be better suited to a 0.92kg spring due to the much higher corner entry speed and the ability to hit large bumps at high speeds. Please note this guide is for rider weight ‘without’ gear.

Please note we have had great results using one spring down for Veteran/ C level riders on the 450 machines.  Eg. 90kg rider running a 0.96kg/mm spring for a plusher ride.

For more accurate advice please consult your local suspension tech or send us an email.

 Rider weight Spring Recommendation ( Pro Level riders may consider one rate harder than recommended due to the faster speed and need for 'hold up')

Key Features

• Never have to set your air pressure ever again.
• Much more reliable fork
• Super smooth action resulting from our tested spring guidance system. 
• Hydraulic Bottoming resistance using our tapered bottoming piston and seat.
• No Fade out or pump up in pressure over long moto’s
• A Constant feel in your front end that  is more consistent throughout the ride
• Spring Pre load adjustable minimal tools are required for fitment. If you have the Fork cap and basic tools to remove the standard OEM Air cartridge you will have the ability to fit up our kit.  Our cartridge kit is made from High grade 6061 Aircraft Grade Alloy , Chrome Moly rods and Anodised for a Factory Finish. Instruction manual included.

Parts included in the kit

• Fully Complete Cartridge assembly including Bottoming Cone and preload washers 
• Optional Selected Eibach spring to suit this kit