What is Solid Shock?

Watch: Hidden Cost of Solid Aperture Tires

“Solid Shock” refers to the impact of G-Force vibration emitted to heavy industrial vehicle operators and their equipment from solid aperture tires. Not only is Solid Shock a major source of wear and tear on machines, but it’s also a leading cause of operator injury. One example is Whole Body Vibration (WBV), which can cause fatigue, back pain, and spinal damage, which can lead to increased worker compensation claims. In contrast, polyurethane filled tires are designed for operator safety because they transfer the lowest G-force vibration of all flatproofing systems.

A significant indication of the cushioning ability of any tire lies in the durometer, or hardness of the rubber compound and other components. A solid tire with high durometer components is harder and absorbs less impact. A tire with low durometer components, such as polyurethane tire fill, is softer and absorbs more impact.

Benefits of TyrFil®

Polyurethane filled tires absorb more g-force vibration to reduce driver fatigue and decrease equipment stress. Heavy duty equipment operators seek as smooth a ride as possible.

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Understanding Durometers

Polyurethane-filled pneumatic tires offer a wider range of core durometers from 8 to 55, allowing heavy equipment operators to customize the deflection of the tire for the application.

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Vehicle Wear and Tear

Another stability factor to be considered is the density of a tire. Filling a pneumatic tire with polyurethane adds less weight to equipment than rubber, yet maintains stability.

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From the perspective of the driver’s seat, TyrFil® polyurethane fill also provides better rough terrain traction and tire deflection (i.e. optimal tire contact area), which can reduce worker attrition and job absence due to a physiological effect called Whole Body Vibration or WBV. The impact of WBV may cause measurable muscular-skeletal and neurological injury to equipment operators. Aside from potential bodily harm to workers, WBV also costs companies utilizing heavy equipment thousands, if not millions of dollars, in lost work time due to driver absence during recovery, along with potential workers’ compensation and liability suits.

Why is Whole Body Vibration potentially dangerous?


Measurement Axes of WBV in the Human Body, Source: ISO 2631-1

Whole Body Vibration (WBV), especially when it becomes a chronic condition, is suspected to cause adverse health effects such as fatigue, lower back pain, vision problems, interference with or irritation to the lungs, abdomen, or bladder, and adverse effects to the digestive, and urinary systems. Other issues include:

  • Back injuries and issues (resulting from constant impact on the driver for up to 8 hours per day) are significant symptomatic effect of the WBV phenomenon – one that can contribute to lessened on-the-job productivity and worker focus.
  • WBV is also a major source of lost time in occupational environments, especially where drivers operate commercial, industrial and heavy equipment/OTR vehicles.
  • About 8 million U.S. workers have occupational vibration exposure. Of these, an estimated 6.8 million are exposed to WBV and the remainder is exposed to Hand-Arm Vibration (HAV) (Source: Bruce, Bommer & Moritz, 2003; ACGIH, 2001)

Recent Field Study Test Tells All

“Vibration transmitted to a vehicle is of great concern. Exposure to constant and severe vibrations will ultimately cause premature fatigue and damage the vehicle components. As vehicles are operated by a riding driver, the effects of vibration on the human component cannot be ignored.”
           Helmut Paschold, PhD., CSP, CIH
           Assistant Professor, Department of Safety Sciences
           Indiana University of Pennsylvania
           Whole Body Vibration, Field Testing Project Consultant

Learn More About the Impact of Solid Shock