Dynamic Load Test

The purpose of the Dynamic Load Test is to simulate the working environment that the tire may be subjected to and to evaluate the tire’s durability and performance.

Test

Complete tire and rim assembly is mounted into a drum test fixture. Each tire will travel at a rotational velocity of 100 RPMs for a total of 24,000 revolutions under weight loads of 150 lbs. and 300 lbs.

Results

Testing has proven that Carefree Tire has the lowest rolling resistance, a leading cause of premature tire failure. Due to the high-density cellular core of its unique design, Carefree Tire maintains its original characteristics after flexing under load significantly more than the competition and pneumatic tires. They also have shown less sidewall stress after thousands of flex cycles compared to the leading competitor’s flat free tire.

The primary cause of rolling resistance is hysteresis: a characteristic of a deformable material such that the energy of deformation is greater than the energy of recovery. The rubber compound in a tire exhibits hysteresis. As the tire rotates under the weight of the vehicle, it experiences repeated cycles of deformation and recovery, and it dissipates the hysteresis energy loss as heat. Hysteresis is the main cause of energy loss associated with rolling resistance and is attributed to the viscoelastic characteristics of the rubber.

National Academy of Sciences

Materials that flex more and bounce back slowly, such as rubber, exhibit more rolling resistance.

With continuous cycling of the rubber pneumatic tire under load, the tire loses air pressure. Lower pressure results in even more flexing of the sidewalls. This energy conversion in the sidewalls increases rolling resistance and can also lead to tire failure.

deflection

Tire Rebound Damping / Shock Absorption Test

Test

Each tire is dropped from a height of 48 inches to compare rebound and effective wheel bounce damping.

Results

Carefree tires prove to absorb shock and dissipate excess energy better than the leading fully inflated pneumatic brand tire and drastically outperforms the competitor’s version of a flat free tire. Shock originating from the tire traveling over irregularities of the ground is readily transmitted to the equipment, which in turn can result in a discomfort to the individual operating the equipment. Carefree Tire’s innovative design and tire composition absorbs excess energy and better dissipates vibration.

tire rebound dampening

Break Away Roll Force Test

Test

Break away force under loads of 250lbs, 350lbs, and 500lbs

Results

Carefree tires performed slightly better than the leading fully inflated pneumatic tire brand and drastically outperformed the competitor’s version of a flat free tire.

break away roll force test

Continuous Roll Force Test

Test

Continuous force under loads of 250lbs, 350lbs, and 500lbs

Results

Carefree tires performed slightly better than the leading fully inflated pneumatic tire brand and drastically outperformed the competitor’s version of a flat free tire.

continuous roll force test

Which tire would you rather push?

The Carefree Tire

C1: Carefree Tire’s footprint under no load – 92mm
C2: After 48 hours under 350 lb load – 114mm.

23% increase

The Competition

A1: Competition footprint under no load – 70mm
A2: After 48 hours under 350 lb load – 155mm.

121% increase

carefree tire push test