Speedo issues

[nfpgasmask]

So, since I have lifted and put on some bigger meat, I am wondering, how much will my speedometer be affected? If I am going 65 and I really going more like 70+?

Bart

[Tone]

http://www.miata.net/garage/tirecalc.html

[etlsport]

hm i saw speedo issues and i was going to suggest a healthier diet and exercise ;Db;

when you put your new info into the tire size calculator, you can put that percentage into your scangauge and the mph, mpg etc readings will be adjusted on there.. check your scangauge manual

[tom4bren]

33's put me zactly 10% over (according to TomTom). Remember it's a percentage & not a set offset.

[MSHardeman]

Tone, thanks for the calculator. I have been wondering about this myself since I put the Nitto's on three years ago, but I can't remember the stock tire size now. Anyone??

[etlsport]

245/60/18 (00-01) or 245/70/16 (99)

[nfpgasmask]

Awesome, thanks Tone, and Etl, I will check my scan guages manual and see if I can get it right.

So basically, I can tell the scan guage that I am 7% too slow and it will adjust the read out on the scan guage to compensate?

I know I am going to get dinged sooner or later.

Bart