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Radial force variation or road force variation [1] (RFV) is a property of a tire that affects steering, traction, braking and load support.High values of RFV for a given tire reflect a high level of manufacturing variations in the tire structure that will impart ride disturbances into the vehicle in the vertical direction.
The lateral force variation can be expressed as a peak-to-peak value, which is the maximum minus minimum value, or any harmonic value as described above. Lateral force is signed, such that when mounted on the vehicle, the lateral force may be positive, making the vehicle pull to the left, or negative, pulling to the right.
Foreign material, such as road tar, stones, ice, or snow, that is stuck in a tire's tread or otherwise adhered to the tire or wheel may also cause a temporary unbalance and subsequent vibration. Uneven weight distribution in the wheel and tire assembly can result from manufacturing inaccuracies, uneven tread wear, damage over time, or improper ...
The total braking force cannot exceed the gravity force on the rider and bike times the coefficient of friction μ of the tire on the ground. mgμ >= Ff + Fr . A skid occurs if the ratio of either Ff over Nf or Fr over Nr is greater than μ , with a rear wheel skid having less of a negative impact on lateral stability.
The centrifugal force experienced by the car tries to throw it away from the turning center. This increases the normal reaction on the outer wheels. Due to increase in normal reaction, the frictional force on the outer tyres also increase. This friction acts as centripetal force and tries to bend the outer tires inwards.
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In an idealised case, i.e. a static, uniform net force normal to level ground, this is simply the object's weight divided by contact area. The ground pressure of motorized vehicles is often compared with the ground pressure of a human foot , which can be 60 – 80 kPa while walking or as much as 13 MPa for a person in spike heels.
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