Yep, depending on how much wear, and how inflated you keep those tires,
you may have been as much as 5% higher than indicated on your
speedometer.

When new my BFG AT T/A's in that size read about 5% higher than
indicated. As they wear, I'm just about right on (measured by GPS).

On Mar 5, 2004, at 7:21 PM, JordanVw@AOL.COM wrote:

> ok, math time here :<) my tires are 215/75/15's.  wouldnt that mean id
> actually be going faster than what my speedo says? and if you factor
> in the error,
> then it evens out to about what the speedo says..right?  i flunked
> algebra,
> dont ask me.. :<)   all i know is that i was passing just about
> everyone. .. and
> on I-78 people fly..