Well I lifted my ranger 3in and then put on some 33s. I was wondering how far off is my speedometer. Ive been noticing it seems to run a little short. Does anyone remeber how far off there speed was off?

 

as u go faster the more it will be off but i believe there is something on the internet that can calculate how far off it is at certian speeds.

 

Try 1 of these

http://www.1010tires.com/TireSizeCalculator.asp

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

 

http://www.therangerstation.com/tech...rom_Tires.html

 

Those calcs are right for me, with going from 29" to 32" it's off 5 mph at 60, speedo says I'm doing 55.

 

Don't forget. You speedometer is off by about 10% So the faster you go the bigger the difference between indicated and actual speed. So at 70 indicated, your speed will be 77, at 80 = 88, etc. I almost got a ticket when I went past an AZ. hwy patrol car indicating 76 in a 75 and they clocked me at 84.

 

Yeah I know, I was just saying for that speed. I think the correct term is exponential or something like that. I forgot all that stuff all ready lol. When I got pulled for doing 70 my speedo said I was doing like 63-64.

 

well i figured mine from 245/75/16 to 33/12.5/15 it was a woopping 3.7 mph off

 

I went from 29's to 31x10.5x16 and at 25mph its dead on but when the speedo says 60mph im actually going 66mph. So mine is about 5-6 off.