Speedometer readings will be proportional to change in diameter of tire. Ifoldtires hada diameter 74cm and the new ones have a diameter79cm, whats actual speed in kph be when speedometer reads70kph?

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70 * 79/74 = 75 Actually 74.73 kph The speedometer measures how quickly the wheel rotates, rolling forward Pi * Diameter with each turn of the wheel. With the increased diameter of the new, bigger wheels, the vehicle is going faster than indicated by the speedometer.