Tire rolling resistance is caused by the natural viscoelastic properties of rubber along with the tire's internal components constantly bending, stretching and recovering as they cycle between their loaded (where the tread footprint flattens against the road) and unloaded states. The final contributor to tire rolling resistance is the tread's interaction with the road.
The maximum load and maximum inflation pressure are required to be branded on the sidewall of tires sold in North America.
Tire pressures are normally measured in "pounds per square inch" (psi), Kilopascals (kPa), or bars of pressure (bars). At sea level, Earth's atmosphere is pressing against the surface with a force of 1 kilogram per square centimeter. This pressure is identified as one "bar," and is equal to 100 Kilopascals or 14.7 pounds per square inch of pressure.
TIRE TECH: TIRE ROLLING RESISTANCE PART 3: CHANGES TO EXPECT WHEN SWITCHING FROM WORN-OUT TO NEW TIRESPosted on
New, Full-Treaded Tires Generate More Rolling Resistance Than Shallow-Treaded, Worn Tires
Tire rolling resistance gradually drops by about 20% during the life of a tire as the tread wears from its original molded depth to worn out. This can be attributed to the reduction in tread mass and rubber squirm, as well as subtle hardening of the tread compound during years of service and exposure to the elements.
While this gradual reduction in tire rolling resistance and minor increase in fuel economy may be too subtle to register during the tire's life on a tank-by-tank basis, the virtually instantaneous switch from worn tires to new tires (even if they are the same brand, type and size) will typically result in an increase in rolling resistance of about 20%. Since the automotive industry estimates a 10% increase in tire rolling resistance will result in a 1% to 2% decrease in vehicle fuel economy, drivers should expect to experience a potential 2% to 4% decrease in mpg.
While size designations for tires (i.e., 245/40R18) and wheels (18x8) confirm matching (18-inch) bead seat diameters, measuring a wheel's overall diameter from the top edge of one flange to the other 180-degrees away will reveal that the wheel, including its flanges, is actually about 1.4" larger (19.4-inches) than designated.
Atturo Tire is the tire brand dedicated to the SUV, Crossover and Light Truck (4x4) segments of the tire market. Atturo designs and distributes stylishly aggressive tires that meet your needs both on and off road. The active outdoor lifestyle embraced by people around the world is driving the growth of the SUV and 4x4 vehicle market. We are the only brand solely focused on delivering tires to support your daily adventure. Atturo is committed to delivering on its promise, to keep performance within reach by continuous improvement and innovation.