| if at 3000 rpms in 5th gear you are moving at 75 mph, with smaller overall diameter wheels you will be at higher engine rpms to maintain that same speed....therefore the car would be slower as you run out of rpms before you could reach the "normal" top speed for each gear. With larger wheel diameters the engine rpms are lower at that same speed (75 mph) therefore making the car "faster". naturally too large a wheel would be increasing the burden on the negine and there is definitely a point of diminishing returns, but this is all mute since no one really wants to screw up their odometer and speedometer and tires are easily bought with sidewall sizes to compensate fo increased or decreased wheel diameter More of a factor for Jeep owners I suppose.
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