hey i just put on 31's on my truck and i was wondering how much faster you go when you doing about 60....cuz my buddy has 37's on his dodge and when he is doing 60 mph on his gauge he was really going about 67 mph...i was just wondering if someone knows the conversion or a site i can go to...i had 235 on before i don't know if that will help....thanks

 

There is a formula somewhere. Mine has 31's on it, 60 means I'm doing 65 roughly.

 

thanks .. umm say im doing about 35 mph then i would be doing like 37 then? is that how it works?

 

i have 31s and i drove by one of those cop speed reader things on the side of the road and i was doing 60 on my speedo and thats what it read on the cop speed reader.

 

I thought 31's were stock size. I got 32's and I'm only off by a mile or two.