BP-51 (Bypass 51mm Diameter Bore) Shock Absorbers

The new BP-51 range of high performance, bypass shock absorbers is the result of an exhaustive development process aimed at delivering the ultimate in both comfort and control.

Designed, developed and tested entirely in-house by ARB’s team of Old Man Emu ride engineers, BP-51 shock absorbers are vehicle specific and utilise existing mounting locations to provide easy installation without the need for additional vehicle modification.

Unlike most other adjustable shock absorbers, which provide adjustment for compression only, the BP-51 range allows on vehicle, independent adjustability of both rebound and compression to offer class leading ride customisation that can be tailored to individual vehicle or trip requirements.

Bypass Technology

In addition to the velocity sensitive damping used in most shock absorbers, where the faster the piston moves, the higher the level of damping is generated, BP-51 shock absorbers also generate damping dependent on the position of the piston within the shock absorber’s body via their bypass design.

While most shock absorbers only generate damping based on fluid flowing through the piston, the BP-51 offers an alternative path from one chamber to the other, around the piston in the form of bypass passages. Some fluid flows through the piston and some fluid bypasses around the piston in the bypass passages.

This results in an ability for the shock absorber to provide the best of both worlds, with a comfortable and compliant ride during normal driving and a more controlled ride over more challenging terrain. With greater levels of damping generated at each end of the stroke, the piston slows as it approaches full compression and extension, preventing harsh topping out against the bump stop and allowing larger bumps and corrugations to be absorbed more easily.

BP-51 Shock Absorber Features

  • Remote Reservoir

    6061 grade aluminium remote oil canister allows for increased oil volume, resulting in lower oil temperatures.

  • High Temperature Hose

    Durable Dash 6 high temperature Teflon hose incorporates high flow fittings for optimum oil flow.

  • Spherical Bearings

    Large, Teflon lined spherical bearings.

  • Spring Seat

    6061 grade aluminium spring seat.

  • X5K Coil

    High quality X5K grade steel coil, for use on coil over models, incorporates application specific design.

  • Spring Adjustment

    6061 grade aluminium adjustor allows adjustment of spring preload and ride height.

  • Top Hat

    6061 grade aluminium top hat.

  • Bushings

    Quality oversized rubber bushings result in excellent longevity.

  • Shaft Guard

    Replaceable, impact resistant, high density polyethylene shaft guard prevents damage to the shock absorber shaft from stones and other debris.

  • Piston Shaft

    Hard chromed, ground piston shaft for the ultimate in strength and durability.

  • Adjustor

    External, independent rebound and compression adjustment allows fine tuning of ride comfort and control to suit varying vehicle and trip requirements.

  • Shock Absorber Body

    51mm bore, 6061 grade aluminium shock absorber body with type III, hard anodised finish for increased heat dissipation and corrosion resistance.

  • Piggy Back Clamp

    Remote reservoir piggy back clamp allows easy connection of the remote oil reservoir to the main shock absorber body.

Development and Manufacturing

All BP-51 shock absorbers are manufactured in-house by ARB. In order to achieve this, significant investment has been made in state of the art machining and hard anodising equipment, allowing ARB total control of the process to ensure the highest possible quality.

BP-51 shock absorber bodies are manufactured using aircraft grade (6061) anodised aluminium to dissipate heat more efficiently than steel or alloy steel and provide superior corrosion resistance.

Extensive lab, real world and destructive testing has been undertaken during the development process to ensure that reliability, longevity and performance all meet ARB’s impeccable standards.



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