Captain_Scion

Has anyone discovered a way to recalibrate an Xb speedo to compensate for slightly taller tires?

Fujiz_xb

hmmm.... i beleive the speed should be the same. maybe the odomoter you mean?

Joehnn

No, I think I read before that the speed and the odometer are affected by the tire size.

I know someone will correct me if I'm wrong. They always do.

jmiller20874

A larger outside diameter tire will cover a longer distance in one rotation than a smaller diameter tire. So your axles are rotating less and covering longer distances, this will throw both speedo and odometer way off if the difference is great. You'll need to have the vehicle recalibrated.

xtremeOrange

The speedometer will be affected, but the degree of inaccuracy depends on the size of the tires you're using. For example, 215/40/17's are going to be merely 1.43% or so larger than stock, and that's at 60mph. If you really want to get into it and find out just how far off you'll be, check THIS calculator.

Captain_Scion

I have used the tire / wheel calculator to determine the error. I am wondering if anyong has found a way to correct the error by changing the gear on the speedo or by entering a different tire size (diameter) into the computer. Thanks -

koalaty2

Or go with a custom speedo face that is altered to take into account the taller tire. Custom Speedo face talked about in another thread.

dgHotLava

the speed is calculated by the amount of tire rotations per given time...

a smaller tire dia. tire means the speedo and odo will show a higher number that what you are really traveling...

now, every car manufature builds in an error of up to 3%...

so running a taller tire will get you closer to true speed readings...

Pooka

If you really want to have it fixed, call the dealership. They should be able to do it. I know the audi dealership does it with my TT when I switch from my normal high performance tires to my winter tires.