speedometer correct after changing tires?

[happystroker]

I recently swaped wheels and tires from 31's to 33's
I have a minimax and was wondering when I change the tire size on it, does re program the odomter on the truck?
the reason why ask is because im wondering if im calculating my fuel millage correct?

[BIG Laing]

Originally Posted by happystroker

I recently swaped wheels and tires from 31's to 33's
I have a minimax and was wondering when I change the tire size on it, does re program the odomter on the truck?
the reason why ask is because im wondering if im calculating my fuel millage correct?

What truck comes with 31's? I thought the only choices were 32.8 and 34.8" tires stock? Dually? or 17" rims?

And yes unlocked mini maxx's have speedo calculation option.

[happystroker]

its an f250 srw xl model so it came with 17" steel wheels and some real small tires... i assumed they were around 31's.....

[BIG Laing]

Originally Posted by happystroker

its an f250 srw xl model so it came with 17" steel wheels and some real small tires... i assumed they were around 31's.....

They should of been 245/75-17, which is 31.5". Or 265/70-17, which is also 31.5"

I did not know the tires on the 17" rims were that small. You should be able to use your mini max to recalibrate. If not, it really isn't that big of a change.

I went from 32.8" to 34.6" which caused everything to be off by 6%. I had the dealer callibrate mine to 34.8 (stock 20" rim size).