Criteria for choosing piston size:
Vehicle type and weigh
- 35 mm Piston : Suitable fort light competition vehicles (Sprint Car, small rally categories).
- 40 mm Piston : Ideal for medium weight vehicles, used mainly for standard rally or rallycross.
- 46 mm Piston : Recommended for heavier or heavily loaded vehicules (dirt rally, demanding conditions).
- 50 mm Piston : Recommended for very heavy vehicles or extreme performance needs (off-road rally with high mechanical stress).
Type of performance sought
- Smaller piston (35 mm) : Fast responsiveness, less internal friction, suitable for fast surfaces and speed applications.
- Larger piston (46 mm, 50 mm) : Better heat dissipation, greater shock absorption, ideal for difficult terrain or long duration.
Use of the vehicle
- Track competition → 35 mm or 40 mm (better sensitivity for grip).
- Rally on dirt or extreme conditions → 46 mm or 50 mm for robustness and stability.
Available options :
CAS (Selective Damping Control) is a technology developed to improve the traction and grip of vehicles by maximizing wheel contact with the ground. This system automatically adjusts the shock absorber hydraulics according to the load applied to the wheels.
When the load is low (when the wheel loses contact), the system reduces the resistance of the shock absorber to allow the wheel to follow the terrain and quickly regain grip. Once contact is reestablished, the system returns to normal operation.
Advantages :
- Faster grip recovery
- Better traction when accelerating and braking
- Optimization of grip on rough terrain
The adjustable hydraulic stop is a system designed to prevent the shock absorbers from bottoming out at the end of their travel while improving the feel for the rider. Unlike conventional stops, it offers a progressive response that efficiently dissipates energy, reducing the shocks felt when the suspension reaches its limit.
Advantages :
- Improved progressivity: Manages the end of travel by gradually stiffening the suspension, without sudden shock.
- Increased comfort: Allows the use of a softer hydraulic curve in the middle of the travel for better absorption of irregularities.
- Reduced hard rebound: Avoid the unwanted effects of traditional foam or pneumatic buffer systems.
FCV (Frequency Control Valve) is an intelligent suspension technology that adjusts the shock absorber behavior based on the direction and frequency of the applied forces.
Functioning :
- A weight detects the direction of the force exerted on the suspension.
- For small impacts (forces from bottom to top), the suspension remains flexible to absorb irregularities in the terrain.
- For heavy compressions (top-down forces), the suspension becomes firmer to provide better control.
Advantages :
- Improved comfort and reduced acceleration experienced by the driver.
- Better management of major impacts, limiting the risk of punctures and mechanical stress.
- Reduced rider fatigue on difficult terrain.
CR Range table :
