EPICA-FRP Cartridge WP XACT KTM SX/GAS GAS MC 2021-2026/HQV 2021
Original price was: $1,980.00.$1,650.00Current price is: $1,650.00.
Our Premium Epica Cartridge Kit Is Made To Order – Avg Lead Time Is 2 Weeks From Order Placement.
EPICA FRP cartridge upgrade for the WP XACT Forks. Improves front-end control, damping consistency, and rider confidence.
1 in stock (can be backordered)
The EPICA WP XACT Spring Conversion Kit is a premium closed-cartridge suspension upgrade designed for WP XACT forks found on KTM, Husqvarna, and GasGas motocross and off-road models. Additionally, the system replaces the OEM air fork configuration with a high-performance spring-based cartridge design that improves front-end feel, damping consistency, rider comfort, and overall chassis stability across a wide range of riding conditions.
Designed for riders seeking a more connected and predictable front-end feel, the EPICA system improves comfort through braking bumps, acceleration chop, and rough terrain while maintaining support during aggressive braking, jump landings, and repeated hard impacts. As a result, riders gain improved confidence, traction, and overall front-end control at speed.
Technology Overview
The EPICA WP XACT Spring Conversion system uses a high-performance closed-cartridge damping design engineered to improve oil control, damping consistency, and tuning precision compared to OEM air fork systems.
Additionally, the system increases mid-stroke support and bottoming resistance while maintaining comfort and front-end feel across changing terrain conditions. Meanwhile, the refined damping characteristics help riders maintain better chassis control throughout aggressive riding conditions.
Key Features
- Closed-cartridge spring conversion system
- Improved damping consistency
- Enhanced mid-stroke support
- Increased bottoming resistance
- Precise damping adjustment capability
- Improved bike stability under braking
- Expanded tuning range for riders and tuners
- More connected front-end feel
- Reduced air-fork inconsistency and pressure fluctuation
Furthermore, the refined internal damping design helps reduce rider fatigue during long motos and demanding riding conditions.
Performance Benefits
- Improved front-end traction and cornering confidence
- Increased damping consistency during long motos
- Reduced harshness through braking bumps and chop
- Improved braking stability and corner entry feel
- More controlled response during jump landings and square-edge impacts
- Increased rider comfort without sacrificing support
- Wider tuning range for rider-specific setup preferences
- More predictable fork performance throughout changing temperatures and riding conditions
Additionally, the system allows riders to achieve a more planted and controlled feel without sacrificing comfort on technical terrain.
Works Construction
The EPICA WP XACT Spring Conversion Kit features precision-machined internal components designed for high-performance racing and demanding riding conditions. Furthermore, the system is engineered to maintain long-term durability, serviceability, and consistent damping performance over extended use.
Riding Applications
The EPICA WP XACT Spring Conversion Kit is ideal for:
- Professional Motocross
- Professional Supercross
- GP and technical terrain
- Off-road racing
- Vet and amateur racing
- Enduro and cross-country riding
KTM SX-F 250/350/450 2021-2026
KTM SX 125/150/250 2021-2026
GAS GAS MC-F 250/350/450 2021-2026
GAS GAS MC 125/250/300 2021-2026
HUSQVARNA FC 250/350/450 2021
HUSQVARNA TC 125/250 2021
Free Piston System
– Free Piston pressure management system designed to support predictable damping characteristics during aggressive riding conditions.
– Dedicated internal pressure management architecture for controlled hydraulic performance.
– Internal oil compensation system designed to maintain stable damping response during repeated impacts and demanding riding conditions.
EPICA cartridge incorporates Lainer’s Progressive Damping System (PDS) for increased hydraulic damping at the end stroke.
– PDS system has up to 12 different adjustments for the end stroke stiffness.
High Speed compression piston is reversible with a large range of settings.
– Machined from premium 7075 and 6060 alloys and hard anodized.
– Reversible High Speed compression piston outer diameter = 38 mm.
– Side A (Flat valve surface) 34mm OD shims for motocross and enduro.
– Side B (Convex valve surface) 32mm OD shims for supercross.
Option to configure Low Speed Valve (LSV) on compression base valve.
Cartridge rod diameter = 14 mm (for an increased oil flow).
Rebound piston diameter = 25mm for better hydraulic control.
Compression high/low speed shims ID 12 mm.
Maximum travel = 310 mm.
Maximum shim diameter for Mid-Valve By-pass = 21 mm.
Ability to set Mid-Valve float clearance with the stack shims.
Mid-Valve/By-pass floating shim ID = 6 mm (for a controlled response on braking bumps).
Rebound shims ID = 6 mm (uses triangular mid-valve shims designed to reduce oil turbulence on compression).
Low friction NBR bottom seal.
Ability to extend the cartridge through the nylon washers.
EPICA Cartridge Mounting Instructions
NOTE: A modification to the OEM lug is required to install this cartridge. The tool below is not required, however aids in the process.
EpIca Cartridge – Lug Fixture For Lathe
| Weight | 8 lbs |
|---|---|
| Dimensions | 36 × 8 × 6 in |
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