Name: Krooztune WP 48mm AER Air Fork to SFF Coil Spring Conversion Kit KTM GasGas Husqvarna See desc.
Brand: Krooztune
SKU: KT-WPATS48
Price: 582.95 AUD
Availability: InStock

The KroozR WP AER 48mm Conversion Kit replaces the standard AER air fork system with a coil spring, delivering consistent performance, improved reliability, and a more predictable front-end feel across all riding conditions.

KroozR WP AER 48mm Air Fork to Coil Spring Conversion Kit

Fitment

KTM SX / SXF / XC / XCF
Husqvarna TC / FC / TX / FX where the longer travel od the KTM is required. The damper side must be changed so both lengths are equal.

Overview

This conversion kit replaces the WP AER48 air fork system with a traditional coil spring and cartridge setup, with compression damping in one leg and rebound damping in the other.

The result is a more stable and consistent fork with reduced maintenance requirements and improved rider confidence.

Kit Contents

Each kit includes the following components:

Complete cartridge assemblies
Optional Eibach coil springs (selected to suit rider weight)
Installation instructions
Decal set

Key Features

Eliminates the need to set or maintain air pressure
Simple installation – remove the top cap, drain the oil, remove the base bolt, and install as a complete assembly
Improved reliability compared to air systems
No pressure build-up or performance fade during extended riding
Consistent front-end feel throughout the ride
Adjustable spring preload with minimal tools required
Manufactured from high-grade 6061 aircraft aluminium with chrome moly rods and anodised finish
User manual included

Spring Rate Recommendation

This kit uses a 44 x 660mm fork spring. Suitable options include:

Teknik 43.5x660, Eibach 964, HiCalibre 19-173, Eibach 928

Application Notes

These recommendations are a guide only. Fork spring selection depends on rider weight, speed, and riding style. For example, a 72kg professional rider may require a stiffer spring than indicated due to higher corner entry speeds and impact loads.

All rider weights referenced are without riding gear.

For veteran or C-grade riders on 450cc machines, a softer spring rate than standard may provide improved comfort. For example, a 90kg rider may achieve a plusher ride using a 0.96 kg/mm spring.

For tailored recommendations, please contact us.

250cc Four Strokes and Two Strokes

KG	LBS	Basic Spring Rate	Pro or A-Grade Rate
< 60	< 130	0.80 kg/mm	0.84 kg/mm
60 - 65	130 - 140	0.84 kg/mm	0.88 kg/mm
65 - 75	140 - 165	0.88 kg/mm	0.92 kg/mm
75 - 85	165 - 185	0.92 kg/mm	0.96 kg/mm
85 - 95	185 - 205	0.96 kg/mm	1.00 kg/mm
95 - 100	205 - 220	1.00 kg/mm	1.04 kg/mm
100 - 110	220 - 240	1.04 kg/mm	1.08 kg/mm
110+	240+	1.08 kg/mm	1.08 kg/mm

450cc Four Strokes

KG	LBS	Basic Spring Rate	Pro or A-Grade Rate
< 60	< 130	0.84 kg/mm	0.84 kg/mm
60 - 65	130 - 140	0.88 kg/mm	0.88 kg/mm
65 - 75	140 - 165	0.92 kg/mm	0.96 kg/mm
75 - 85	165 - 185	0.96 kg/mm	0.98 kg/mm
85 - 95	185 - 205	1.00 kg/mm	1.04 kg/mm
95 - 100	205 - 220	1.04 kg/mm	1.04 kg/mm
100 - 110	220 - 240	1.04 kg/mm	1.08 kg/mm
110+	240+	1.08 kg/mm	1.08 kg/mm