Can A Change In Tire Diameter Be Accurately Calculated ??

[billt]

My new Jeep has the U-Connect 8.4" computer screen. You can look up anything, from the price of gas in your area, to the best rated pizza joints. And most anything in between. It wouldn't be hard at all for them to have a page of all the different tire sizes that will clear the fender wells of a Jeep Grand Cherokee.

All you would have to do is touch the correct tire size you wish to install, then touch "APPLY", and the speedometer along with the odometer would instantly calculate the change. They could even factor in tire pressure, because it also displays the current tire pressure for each wheel in real time. I can watch my tire pressure rise as they heat up, from when I pull out of the garage on cold tires, as I drive on the freeway at 70 MPH.

[Solus]

problem with owner adjustment of of the speedometer settings is it makes it easy and impossible to detect fraudulent mileage changes. 

On an analog speedometer, bars would appear between the numbers if it was wound back...not sure if there is protection on modern digital ones anyway?

[Timothy]

I had to change some indicator lights on my dash some months back.  The speedo, tach, fuel, oil pressure and amp gauges were all modular.  I could have replaced any and all of them including the odometer.

Changing the mileage ain't that tough...at least on my beater truck...

[mkm]

I had to change some indicator lights on my dash some months back.  The speedo, tach, fuel, oil pressure and amp gauges were all modular.  I could have replaced any and all of them including the odometer.

Changing the mileage ain't that tough...at least on my beater truck...

They let you drive that in Massachusetts? I figured you would either get thrown in jail or hauled to the state line. [emoji3]

[Timothy]

They let you drive that in Massachusetts? I figured you would either get thrown in jail or hauled to the state line. [emoji3]

LOL

No, they wouldn't let me drive that...  Wifey's truck, she blew a rear brake line last week, thank God she was in a parking lot.  It's easier for this old fart to remove the bed to access the line, do the shocks, cut off and replace the shackle mounts, shackles and do the back brakes.  Might last me another 10 years that way.  I did pretty much the whole front end back in April.  It's only got 106K on a near 14 y/o feather hauler...

Gonna grind a bit o ferrous oxide off the chassis and put some Krylon on there as well..

[Sponsor]

[crusader rabbit]

LOL

Gonna grind a bit o ferrous oxide off the chassis and put some Krylon on there as well..

Spray some Phoz (phosphoric acid solution) on first.  That alters the surface rust and makes it an almost impermeable surface.  Plus, it accepts paint and enhances adhesion.  Should find it at Lowe's or Homer's.

FWIW

Crusader Rabbit

[Timothy]

Thanks Mr Rabbit!  I'll look into that!

[PegLeg45]

You would think by now, the way cars have advanced, they would have a speedometer adjustment on them for different size tires. Aftermarket tires are so popular today.

I did change mine. When my truck was new, I bought a Hypertech Power programmer and one of the functions was a speedo calibration to match the larger tires that came as an option.

[PegLeg45]

Spray some Phoz (phosphoric acid solution) on first.  That alters the surface rust and makes it an almost impermeable surface.  Plus, it accepts paint and enhances adhesion.  Should find it at Lowe's or Homer's.

FWIW

Crusader Rabbit

+1 to what Brother Rabbit said......


Also, for a few more bucks, look into painting it with Por-15. The frame will be basically impervious to salt and rust, and you'll not have to do it again (just don't coat threads with it  ).

http://www.por15.com/

[Timothy]

Is all that compatible with a plastic fuel tank and stock fuel lines?