AER43 KTM / Husqvarna / GASGAS 85cc Air to Spring Conversion Kit

Replace your original WP AER 43 air cartridge with a coil spring conversion for a more predictable front-end feel and consistent performance throughout your ride.

Designed for 85cc riders, our complete replacement cartridge removes the air spring system and replaces it with a preload-adjustable coil spring assembly. Choose a spring to suit your rider’s weight, ability and preferred feel.

Fitment

Fits 2018–2027 KTM, Husqvarna and GASGAS 85cc models equipped with WP AER 43 air forks.

Key features

• No more air pressure checks: Replaces the original air spring system with a coil spring.
• Consistent feel throughout the moto: Eliminates heat-related air spring pressure increases.
• Adjustable spring preload: Fine-tune your setup to suit the rider.
• Straightforward installation: Slides into place as a complete replacement for the original air cartridge. Fitting instructions included.
• Quality construction: High-grade 6061 aluminium, chrome-moly rods and an anodised finish.
• Spring options: Available to suit different rider weights and riding levels.

What’s included

• Complete replacement cartridge assembly.
• Optional fork spring—select when ordering.
• Fitting instructions.
• Decal set.

Choosing your spring

Spring selection is based on rider weight without riding gear, with adjustments for ability, speed and riding conditions.

Faster, more experienced riders may benefit from a firmer spring for additional support. Beginners and C-grade riders may prefer a softer spring for a plusher feel.

Need help choosing? Email us with your bike model and year, rider weight and riding level, and we’ll help you select the right spring.