Tire size- How Big?
Freshman User
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Well when You change a tire and go to a bigger size the speed or the amount of turns the driveshaft spins to turn a bigger wheel is different, so when you go to a taller ratio you can make the motor rpms match what they used to be with the stock tires giving you more power and and better mileage. The rule of thumb i have always heard is you get most of it back minus about 10% due to the new added wheel weight and aerodynamic drag. Unless of course your truck is gigantic with 44's
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Junior User
Joined: Oct 2005
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Originally Posted by rascal1
Well when You change a tire and go to a bigger size the speed or the amount of turns the driveshaft spins to turn a bigger wheel is different, so when you go to a taller ratio you can make the motor rpms match what they used to be with the stock tires giving you more power and and better mileage. The rule of thumb i have always heard is you get most of it back minus about 10% due to the new added wheel weight and aerodynamic drag. Unless of course your truck is gigantic with 44's
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Joined: May 2005
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From: shiloh, kentucky
I believe there may be some confusion about tire sizes.
LT235/85-16
LT = light truck
235 = width of the tire in millimeters, a 255 is wider than a 235 by 20 millimeters
85 = ratio of height to width (85% of width or 75% of width, an 85 is a taller tire than a 75)
16 = diamter of wheel in inches
A taller tire will lower your rpm which should help improve your fuel mileage unless you are running a wider tire too which may cause more drag. A shorter tire will raise your rpm at the same speed resulting in lower fuel mileage.
LT235/85-16
LT = light truck
235 = width of the tire in millimeters, a 255 is wider than a 235 by 20 millimeters
85 = ratio of height to width (85% of width or 75% of width, an 85 is a taller tire than a 75)
16 = diamter of wheel in inches
A taller tire will lower your rpm which should help improve your fuel mileage unless you are running a wider tire too which may cause more drag. A shorter tire will raise your rpm at the same speed resulting in lower fuel mileage.
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Junior User
Joined: Oct 2005
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Originally Posted by MikeFromShiloh
I believe there may be some confusion about tire sizes.
LT235/85-16
LT = light truck
235 = width of the tire in millimeters, a 255 is wider than a 235 by 20 millimeters
85 = ratio of height to width (85% of width or 75% of width, an 85 is a taller tire than a 75)
16 = diamter of wheel in inches
A taller tire will lower your rpm which should help improve your fuel mileage unless you are running a wider tire too which may cause more drag. A shorter tire will raise your rpm at the same speed resulting in lower fuel mileage.
LT235/85-16
LT = light truck
235 = width of the tire in millimeters, a 255 is wider than a 235 by 20 millimeters
85 = ratio of height to width (85% of width or 75% of width, an 85 is a taller tire than a 75)
16 = diamter of wheel in inches
A taller tire will lower your rpm which should help improve your fuel mileage unless you are running a wider tire too which may cause more drag. A shorter tire will raise your rpm at the same speed resulting in lower fuel mileage.
31.7in tall is the hieght of tire i am running right now. BFG commercial TA 235/85/16. Im looking for taller RPM lowering tires.
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