Can someone give me a quik recalculation for bigger tires?

Sleeper · Dec 19, 2008

Well i read you have to recalculate for bigger tires in your head for proper MPG's, well i have 31's on my 2000 XJ and was wondering if anybody knew or could tell me how to do this?

Thanks

CharlieMopps · Dec 19, 2008

recalculate what? You mean you need a different speedo gear?

Sleeper · Dec 19, 2008

Ik now i need a dif speedo gear but i wanted to know what % to add when trying to figure out my gas mileage problem to get a correct reading.

CharlieMopps · Dec 19, 2008

hrm... well, its going to be kind of hard. Your speedo gear is wrong, so your millage is wrong as well. You can't trust your odometer. I've never heard of trying to do the math to figure out the difference, but it would involve firguring out the % difference in the circumference of the tire and multiplying it times the millage you have.

So, if you got 200 Miles on your jeep, and your tire is 3% larger. You would have to multiply 200 * 1.03 and devide that by gallons used.

Are you tires ACTUALLY 31"? or is that just what they read on the side? For example, my tires are 33s but if you measure them, they are actually about 32.5"

Are stock tires 29"? I forget.

Sleeper · Dec 19, 2008

CharlieMopps said:
hrm... well, its going to be kind of hard. Your speedo gear is wrong, so your millage is wrong as well. You can't trust your odometer. I've never heard of trying to do the math to figure out the difference, but it would involve firguring out the % difference in the circumference of the tire and multiplying it times the millage you have.

So, if you got 200 Miles on your jeep, and your tire is 3% larger. You would have to multiply 200 * 1.03 and devide that by gallons used.

Are you tires ACTUALLY 31"? or is that just what they read on the side? For example, my tires are 33s but if you measure them, they are actually about 32.5"

Are stock tires 29"? I forget.

I think stock are 28 but don't quote me on that:callme: The 31's are BFG AT's so i believe they are actually 30.5 if i remember. I keep hearing people in threads ask if someone has calculated for thier bigger tires to get correct MPG's per tank or xxdxxgallons, i myself have filled up and have a 1.5 gallon can in back and plan to run it till it runs out completely the ncalculate for the tire difference and my real world MPG's. I have a problem with it now as i am getting 11 MPG'S and osmetimes 10.

Can someone give me a quik recalculation for bigger tires?

Sleeper

NAXJA Forum User

CharlieMopps

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Sleeper

NAXJA Forum User

CharlieMopps

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Sleeper

NAXJA Forum User

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