Z1's X-Pro Rear Shocks were developed to deliver the same dual-purpose performance philosophy as the front system: exceptional off-road capability without sacrificing on-road composure. Designed and validated through in-house dyno testing during development, the X-Pro platform prioritizes damping control, thermal stability, and long-term durability in demanding environments.
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.
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Extended Travel Design
One of the defining features of the X-Pro system is its extended travel shock architecture. With up to 8" of usable stroke, these shocks 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. The shocks were engineered to work within common lift heights and can be purchased in three different lengths.
The X-Pro utilizes a gas-charged monotube architecture, chosen for its superior consistency compared to twin-tube designs. The monotube layout allows for a larger piston and increased thermal capacity, reducing shock fade. This architecture is particularly advantageous in off-road applications where extended suspension cycling can quickly expose weaknesses in thermal efficiency and fluid stability.
A slim rubber bumpstop is placed on the shaft, preventing harsh bottom-outs and helping protect the shock in the event it's over-collapsed. With all extended-length shocks, Z1 recommends installing an extended-length bumpstop as a primary form of shock protection.
Features:
- Dyno tested in-house
- Mildly digressive valve profile
- Monotube shock architecture
- Large 56mm piston
- Available for multiple lift ranges
- Stock - 1.0"
- Shock Lenth = 21"
- Shock Stroke = 7.5" (190mm)
- 1.0" - 2.0"
- Shock Length = 23"
- Shock Stroke = 7.9" (200mm)
- 2.0" - 3.0"
- Shock Length = 24"
- Shock Stroke = 8" (203mm)
Specifications:
- 2.44" Shock Body
- Up to 8" Shock Travel
- Full Steel Body
- Billet Aluminum Upper and Lower Mount
- Shaft Diameter - 18mm
- Gas-Charged Monotube Shock
Fits:
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