New rims and tires question

[mjpaltima08]

I am thinking about buying new rims and tires.

However, I realize that my speedo will be slightly off.

Is there a ECU or a programmer that I can input my rim and tire size in it to compensate for the new tire and rim size?

I had a Mustang Gt and I had a hypertech programmer that could do that.

If their is not a way to reflash the ECU, what are my options to get the speedo calibrated easily?

I live in the midwest, so I would rather not take it to the dealer 2 times a year for my winter and summer tires and rims for speedo calibration

Thanks

[LongBeachCoupe]

depends on your wheels... it could be insignificant... im over diameter and its not noticable.

[Robs_altima]

You won't be any more than 1-2mph off at 60mph if you keep the diameter within the nearest available size.