Motorcycle:Shock Absorbers(rear cushion)

Functions and Roles

Shock Absorbers

Shock absorbers consists of spring which determine posture and cushioning buffer action and a damper which suppresses vibration.
On 2-wheeled vehicles, shock absorbers are separated into the categories of the “front fork” and “rear cushion”.
The rear cushion:

  • Maintains posture of the vehicle.
  • It eases the thrust of shocks on rough roads.
  • The rear cushion prevents changes in the contact forces between the rear tires and the road surface, conveys the driving power from the rear tire smoothly to the surface of the road, and creates conditions that conduce excellent traction as it maintains the power of the vehicle and damping capacity.

Types of shock absorbers

Double tube type

Double tube type Constructed with double tubes, in side is an oil chamber and outside is an air chamber . Have types with low pressurization to obtain further stable damping. Applied from small commuters to large-sized cruisers.
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Single tube type

Pressurized type (single tube type)

Pressurized type (single tube type)

Demonstrate high performance due to construction of separate oil and air chambers.
In some smaller vehicles, partitions are not applied ( emulsion type ).
Applied to wide range of models.
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With pressurizing sub-tank

With pressurizing sub-tank

Basically similar with a singe tube construction, however excellent in heat dissipation.
This type have wide range of settings.



SHOWA's Approach

SHOWA develops its technology for stock motorcycles based upon feedback gathered from data for 2-wheeled vehicle road races and motocross races.

Thanks to recent improvements in dynamic performance, the gripping power of the tires, improvements in the efficiency of the brake system, the increased control of sudden frontal subduction when breaking, as well as increased absorbency of road surface gaps along with a compatible riding comfort, SHOWA has been able to develop its B.P.F. forks for road models. By striving to achieve further improvements to the rear cushion and in tire traction, we have also succeeded in installing the B.F.R. system in bikes for road racing as we aim for mass production.
With the large diameter front forks used in off-road models, and with regard to the weight trends of highly rigidity, we have been able to achieve significant weight reductions in our S.F.F. construction designed to enter the mass market. Through feedback from stock models utilizing performance and functional improvements cultivated from the limits of racing, SHOWA aims to provide shock absorbs that have achieved:

  • A high level of driving safety
  • Exceptional riding comfort
  • Weight reductions

Furthermore, in light of our anticipations for increased future sales expansion in the Asian market, and in order to be able to provide ever more attractive products for our users, we are opening a new R&D facility in Thailand that is to serve as our Asian base. We feel that have been able to prepare an extremely timely development system.