tires on my 1500

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HomeBrewer - 01 Mar 2005 01:14 GMT

My truck came stock with 245/70 R17s - I want to put a 265 or 275 size tire
on it. Will this screw up the speedo or anything else? If so what gadget do
I need to get to fix it. I know some of the same trucks came with 265/70
R17s. Thanks for any help...

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.boB - 01 Mar 2005 04:46 GMT

> My truck came stock with 245/70 R17s - I want to put a 265 or 275 size tire
> on it. Will this screw up the speedo or anything else? If so what gadget do
> I need to get to fix it. I know some of the same trucks came with 265/70
> R17s. Thanks for any help...

Depends. Changing the diameter of the tire will
alter the speedometer. 265 or 275 would be a wider
tire than a 245. If you change the aspect ratio to 60,
55, or 50, you'll be much close to the stock diameter.
You'll have to do the math on that and see where
you need to be.

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HomeBrewer - 01 Mar 2005 11:14 GMT

The trucks that came with 265/70s from the factory must have some kind of
chip or gear to make the speedo accurate. Is this changeable by me? What
does it cost?

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Jerry - 01 Mar 2005 15:53 GMT

> The trucks that came with 265/70s from the factory must have some kind of
> chip or gear to make the speedo accurate. Is this changeable by me? What
> does it cost?

It's done by having the dealer flash the computer. Or you can do as I
do, pay it no never mind as it will be off only 3-4%.

Jerry

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TBone - 01 Mar 2005 17:27 GMT

> > The trucks that came with 265/70s from the factory must have some kind of
> > chip or gear to make the speedo accurate. Is this changeable by me? What
> > does it cost?
>
> It's done by having the dealer flash the computer. Or you can do as I
> do, pay it no never mind as it will be off only 3-4%.

Or just about any good performance programmer can do it and many allow you
to adjust your shift points as well.

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