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Tire Care & Safety
Rolling Resistance and Fuel Consumption
Rolling resistance refers to the various forms of resistance against driving force when the car is in motion. Several factors contribute to rolling resistance, including wind drag on the car, acceleration resistance generated by inertia force when speeding up, and resistance on the tires.
- (A) Resistance on car
- (B) Resistance on tires
- Inertia
- Wind drag
- Acceleration resistance
- Rolling resistance
- Impact on tires
- Wind drag
- Tire distortion
- Friction with the ground
Loss of energy due to tire distortion when driving
Hysteresis loss occurs when this section gets distorted
Relation between rubber (viscoelastic body) distortion and force
- Force
- (A) Force
- (B) Distortion
- (C) Energy loss
Loss of energy from friction when tread rubber touches the ground
Although differing by road surface condition, tire type and tread pattern, resistance caused by friction between the tire and the ground accounts for less than 10% of total rolling resistance.
Loss of energy from wind drag as tires rotate
Relation between resistance and speed
- (A) Driving resistance index
- (B) Speed(km/h)
- Resistance caused by power transmission
- Rolling resistance
- Wind drag
Driving resistance increases sharply the faster you drive.