The Z1 Frontier / Xterra X-Pro Coilover System was developed to meet the unique demands of vehicles that must perform reliably in both off-road and on-road environments. The design directive emphasized off-road performance (particularly stability and control) without introducing the compromises in noise, vibration, and harshness (NVH) that often accompany performance suspension systems when used on the street.

Development & Testing

During the development phase, each iteration underwent in-house dyno testing to validate valve profiles and damping curves. The engineering team focused on optimizing a mildly digressive valve profile, chosen for its ability to deliver firm, controlled damping at low shaft speeds (body roll, pitch, and dive) while allowing increased flow at higher shaft speeds to absorb larger bumps and impacts without excessive harshness. This dual-characteristic behavior is central to maintaining confidence in off-road conditions while ensuring comfort and composure during highway driving.

At the heart of the X-Pro is a 56mm diameter piston housed within a 2.44” (62mm) steel shock body. The increased piston size improves fluid displacement, damping response, and thermal stability. Paired with the 2.44” steel body finished in a heavy-duty electrophoretic black paint, the X-Pro benefits from increased oil volume and robust structural integrity. The combination enhances resistance to shock fade during sustained off-road use and ensures long-term reliability under heavy cycling loads.

Extended Travel Design

One of the defining features of the X-Pro system is its extended travel shock architecture. With 125mm of usable stroke, these coilovers provide greater suspension articulation compared to standard travel designs in the same application. The increased stroke enhances wheel travel, allowing the suspension to better follow terrain, maintain tire contact, and improve traction in off-road conditions. Despite the longer travel range, the shocks were engineered to maintain proper ride height adjustability (2”- 3” of lift) and on-road stability. This balance is achieved through precise packaging of the 56mm piston within the 2.44” steel body, ensuring durability and consistency under both compression and rebound extremes.

The X-Pro utilizes a gas-charged monotube architecture, chosen for its superior consistency compared to twin-tube designs. The monotube layout allows for larger piston sizes and improved heat management while minimizing cavitation within the damping fluid. This architecture is particularly advantageous in off-road applications where extended suspension cycling can quickly expose weaknesses in thermal efficiency and fluid stability.

Mounting & Adjustability

While spherical bearings are common in performance coilovers, they often transmit undesirable noise and vibration into the chassis. For the X-Pro, Z1 specified bushing-style top hats and eyelets. This design reduces NVH without eliminating the compliance and articulation required in off-road scenarios. The result is a suspension system that offers precise damping control while maintaining the refinement expected for daily-driven vehicles.

The X-Pro coilovers provide 2”- 3” of lift adjustment through threaded preload collars, allowing users to fine-tune ride height and spring preload for different load conditions. With available spring rates of 500 lb/in and 600 lb/in, the system can be configured for lighter builds prioritizing comfort or heavier setups demanding increased load capacity and roll control.

Features:

• Dyno tested in-house
• Bushing style top hat and eyelets for a smoother ride / less noise
• Mildly digressive valve profile
• Adjustable preload
  • 2" - 3" of lift
• Available in multiple spring rates
  • 500lbs/in (+25lb over stock)
  • 600lbs/in (+125lb over stock)

Specifications:

• 2.44" Shock Body
  • 56mm Piston
• 125mm Shock Travel
  • Compressed Length 12.1"
  • Extended Length 17"
  • 17" Overall Length
• Full Steel Body
• Billet Lower Mount
• Shaft Diameter - 18mm
• Gas-Charged Monotube Shock

(Click image above for full resolution image)

Available for the following:

• 2005-2021 Nissan Frontier
• 2022+ Nissan Frontier
• 2005-2015 Nissan Xterra
• 2005-2012 Nissan Pathfinder

*** This item does not qualify for any additional discounts or promotions ***