$410.00
Replace your WP AER 43 air system with a dual-spring conversion that removes harshness, inconsistency, and the need for constant adjustments — delivering plush small-bump compliance, improved stability, and predictable performance lap after lap.
1 in stock
Lainer Suspension Dual Spring Conversion Kit – WP AER 43 (0.39 kg/mm)
Upgrade your WP AER 43 forks with the Lainer Dual Spring Conversion Kit — engineered to replace the stock air system with a precision dual-spring setup. The result? Increased stability, consistent performance, smoother small-bump absorption, and a more planted front-end feel.
By removing the air system’s pressure fluctuations and temperature sensitivity, this kit ensures predictable suspension performance lap after lap — no more chasing settings between motos.
It delivers increased bottoming resistance, giving you the confidence to charge harder through rough terrain and big landings. Premium CNC-machined aluminum and high-grade nylon internals ensure exceptional durability and long-term performance.
Complete Dual Spring System (springs included)
Spring Rate: K 0.39 (ideal for rider weight: 120–136 lbs)
Built-in Hydrostop for added bottoming resistance
High-strength aluminum and nylon components replace stock plastic parts
Maintains compatibility with the OEM air system if desired (for hydraulic upgrade only)
KTM SX 85 (2018–2025)
Husqvarna TC 85 (2018–2025)
GASGAS MC 85 (2021–2025)
Installation Instructions: <Learn More>
| Weight | 2 lbs |
|---|---|
| Dimensions | 4 × 4 × 2 in |
Ethan –
Swapped out the air cartridge for this kit and honestly, I should’ve done it way sooner.
No more messing with air pressure between motos — it just works.
The front end feels planted, small bumps don’t rattle my hands, and big landings aren’t sketchy anymore.
— Ethan W.,