SOLUTION: I'm replacing the tires on my truck and want to know my engine speed (RPM) with the new tires. Old tire revolutions per mile = 794 / new tire revolutions per mile = 782. Engine spe

Question 111847: I'm replacing the tires on my truck and want to know my engine speed (RPM) with the new tires. Old tire revolutions per mile = 794 / new tire revolutions per mile = 782. Engine speed at 65MPH with old tires = 3,100 RPM. What is my engine speed going to be with the new tires?
Thanks,
Mike
Answer by checkley71(8403) (Show Source): You can put this solution on YOUR website!
792/782=X/65 NOW CROSS MULTIPLY
782X=792*65
782X=51480
X=51480/782
X=65.83 THE NEW SPEED BECAUSE OF THE LARGER TIRES.
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