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Tire size with GPS
Posted: Wed Jul 02, 2008 6:11 pm
by bigdawg04
I do not own a GPS but would like to set the tire size from a GPS so the ole speedo will be correct. I currently have 265/75/16 on my 2007 2500hd
Can anyone with a GPS let me no what the correct tire setting would be , Thanks
RE: Tire size with GPS
Posted: Thu Jul 03, 2008 1:17 am
by jimmycurtisjr
I have the same set up you do and set the tire size to 30.5 and came out dead on.
RE: Tire size with GPS
Posted: Thu Jul 03, 2008 7:48 am
by rydnhi4x4
I have 285/75/16 on mine, but I had to enter 265/75/16 to get my speedo right on using a GPS.
RE: Tire size with GPS
Posted: Thu Jul 03, 2008 7:21 pm
by bigdawg04
Jimmy I take it you got your settings from a gps ? Anyone else ?
RE: Tire size with GPS
Posted: Thu Jul 03, 2008 11:51 pm
by cowdoc
I have 265/75/16's as well. I use 244/75/16 and mine is dead on with my GPS.
RE: Tire size with GPS
Posted: Fri Jul 04, 2008 4:37 am
by jimmycurtisjr
Yes I used my GPS to get mine dialed in. From What I've heard it is the most accurate way.
Re: RE: Tire size with GPS
Posted: Tue Jul 08, 2008 2:36 pm
by countrymac
rydnhi4x4 wrote:I have 285/75/16 on mine, but I had to enter 265/75/16 to get my speedo right on using a GPS.
When you had yours set at 285/75/16 was your speedometer slower then what your GPS stated or faster?
I used Diablo to change my tire size but it doesn't seem to have changed my speedometer at all which appears to be 2 mph slower then what the GPS states.
The truck came factory with 245/75/R16
Currently the truck has....... 285/75/R16 which is what is programmed using Diablo...
Any help is most appreciated.
RE: Re: RE: Tire size with GPS
Posted: Tue Jul 08, 2008 4:52 pm
by rydnhi4x4
When I used the tuner to set the 285's it didn't change it all. I just kept playing with different sizes until I got the right size which was 265/75/R16.