# 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

Algebra ->  Algebra  -> Equations -> 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      Log On

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 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, MikeAnswer 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.