Will I throw my speedometer off??

[John D.]

I'm looking at some 245/50/16 tires to replace my 225/60/16's. Will this mess up my speedo any? I'm thinking it won't but I just want to make sure.

[ July 25, 2003: Message edited by: John D. ]</p>

[malice10985]

It will mess up your speedo... but not more that about 1mph.

Since our stock gauges are not dead nuts accurate anyways, it is a negligable difference.

[John_D.]

You can plug the old and new tire sizes into one of the tire size calculators and see what the diameter difference is. Most of them will tell you what your speedometer error will be, in percent. You can experiment with a couple of different tire sizes to see which one is closest to your stock diameter.

Here's a link to one:
http://www.miata.net/garage/tirecalc.html