got a quick question guys
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A bigger tire will travel farther in one rotation than a smaller tire. I can't remember the math off top my head, but just throwing out numbers, a stock size tire will rotate 500 times in a mile. A tire two inches taller will rotate 475 times a mile. So by adding a bigger tire, u have just lowered your overall drive ratio, which lowers rpm.
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It's just simple gearing calculations. Obviously going too big will offset the other way since it's a TON of rolling weight you'd be adding. Luckily we all drive diesel trucks that have enough power to turn these tires over with ease. Like GreenGoblin said, a taller tire will rotate less times in a fixed distance, thus lowering your cruising RPM's at a given speed.
Don't forget to get the speedo recalibrated so you can accurately measure your mileage. If the mileage is off, your MPG calculation will be off.
Don't forget to get the speedo recalibrated so you can accurately measure your mileage. If the mileage is off, your MPG calculation will be off.
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