WP Suspension, used in the KTM family motorcycles, offers both closed cartridge and open cartridge fork systems, each with its own characteristics. Here’s a comparison:
1. Closed Cartridge Forks:
- Design: The closed cartridge system contains an internal cylinder (cartridge) that separates the oil used for damping from the outer chamber. It’s more complex and requires precise engineering.
- Performance:
- Provides consistent damping performance, even under aggressive or high-speed riding conditions.
- Less prone to cavitation (air mixing with oil), ensuring consistent fork behavior.
- Typically offers better heat management and is well-suited for racing and off-road use.
- Maintenance:
- Requires specialized tools and knowledge for maintenance and tuning.
- Generally more expensive to service and set up initially.
- Use Case: Preferred for high-performance motorcycles, racing, and off-road bikes where precision and consistency are crucial.
2. Open Cartridge Forks:
- Design: In an open cartridge system, the damping oil flows between the inner and outer chambers without a sealed cartridge separating them. It’s simpler in design and more straightforward to understand.
- Performance:
- Provides a more plush and compliant feel, making it ideal for street and everyday riding.
- May experience more cavitation under aggressive riding, which can affect consistency.
- Easier to adjust for different types of riding but may not offer the same level of fine-tuning as closed cartridges.
- Maintenance:
- Easier to service and adjust compared to closed cartridge systems.
- Generally less expensive to maintain.
- Use Case: Suitable for street bikes, entry-level motorcycles, and riders who prioritize comfort over extreme performance.
In summary, closed cartridge forks are best for performance-oriented riders looking for precise control and consistency, while open cartridge forks are more suitable for general or street riding, offering comfort and easier maintenance.
Bulgaria offers a big variety of terrain for hard enduro, this means we need to have the adjustability of a closed carthridge. We have new KTM EXC 2024 dirtbikes equiped with the new closed carthridge WP suspension, which means you will get to experience the best of modern motorcycles.


