Bilstein Offroad Prerunner Series Single Rear Shock
The Prerunner range has been developed with 4x4Proyect in collaboration with Bilstein. The range offers uprated shocks with finely tuned spring washer design and an additional valve in the reservoir.
The Bilstein Offroad Prerunner 2.65″ shock fits both rear sides of land rover defender series 200, 300, td5 and TD4 diesel or petrol with 90 or 110 wheelbase. Suitable for lifts from 3.5″-5.5″.
The direct fit design makes it easy to install with no modifications required. It comes standard with digressive self-adjusting digressive valving that adapts to any terrain while maintaining full control and stability.
Some of the Bilstein 2.65″ Prerunner shocks features are:
Many offroad drivers have complained about their shock’s bearings not being up to the task of handling the forces they put them through. To solve this problem once and for all, the Prerunner shocks have been designed to accept a size 12 bearing, the biggest in its class, supporting up to 78.000lbs of load and increasing its service life up to 150% when compared to the competition. As if that wasn’t enough only premium quality bearings from the best manufacturers on the market, FK Rod Ends are used in these shocks.
The Anti Cavitation Valves are from Bilstein’s 9200 racing series. This revolutionary and exclusive fixed piston sits on top of the external reservoir acting as a accelerometer-decelerometer. The ACV is designed to exponentially increase the internal pressure on the shock oil as the velocity of the shaft stroke increases. By virtually eliminating the possibility of shock fade due to cavitation, the shock is able to withstand extreme working conditions, even racing environments, while maintaining full comfort on any terrain. Last but not least the ACV valve delivers excellent bottom out protection on rough grounds and hard impacts.
Ultra Hard Piston Rod:
The choice of the massive 22mm piston rods for Prerunner shocks was based on multiple tests, many of them destructive. The final result is a rod with a hard chrome surface with up to 3 tenths depth covering a heavy duty induction hardening treatment of up to 3mm. This gives the rod a hardness of 61 to 63 on the rockwell scale. That is much more than any piston rod will ever need, but its better to be safe than sorry. As a matter of fact these same rods are used on Bilstein’s 9300 racing series bypass shocks that are so respected in many race series such as the Baja.
High Capacity External Reservoir:
Common belief is that big external reservoirs are used only to fit more oil and thus cool better. While this is approach is not entirely wrong the most important task of a big reservoir is to increase the nitrogen capacity. Reason being is that as the rod enters the shock on a compression stroke it displaces a volume of oil equivalent to the portion of rod entering the shock. As oil is incompressible it is the nitrogen that has to accommodate for this change by compressing. Therefore, the larger the nitrogen volume the lesser counterpressure it will generate on compression thus making the shock absorber smoother and more stable. Since, according to thermodynamics, large pressure changes result in big temperature changes, reducing those pressure changes will reduce the shock’s working temperature and increase its resistance to fading. Therefore the best solution to increasing a shocks performance is to fit a high capacity reservoir with an extra-large nitrogen chamber.
Redundant Nitrogen Fill Port Safety Cap:
To protect the fill port there is additional sealed billet aluminium safety cap over it. This redundant cap keeps nitrogen in the shock even in the event of a failure of the primary Schrader valve. On top of that the machined thread on cap provides excellent protection against flying stones and debris for the Schrader valve itself.
- 2.65″ shock body diameter
- Ultra hard 22mm piston rod
- Anti Cavitation Valve (ACV)
- 30% larger high capacity reservoir
- Self-adjusting 60mm digressive valving
- Oversized 30.5mm bearings with 78.000lbs radial load capacity
- PTFE-lined bearings for silent operation
- Fully serviceable and rebuildable shocks
- Redundant nitrogen fill port billet safety cap
- Oversized 10mm ID hoses for unrestricted flow
- 3mm wall thickness heavy duty steel construction
- 2.5″ external 3 stage bumpstop
- Clearcoated zinc treatment for best corrosion protection
- High-misalignment bushings for maximum flex
- 16mm heavy duty shock stems where applicable
- Proprietary high flex polyurethane bushings
- High torque internal rod guide
- Hand-build and quality-checked
- All mounting hardware included
- Direct fit installation with common handtools