> I'm mounted 205/65R15's in January and the speedo stayed right where it had
> been with the 185R14s  I took off, 2% off, reads just under 2 MPH low at a
> true 60 MPH.

205/65-15 is the same diameter (25.6") as the original 185R14s.
I just took off some Nokians of that size after 44,000 miles.

My speedo was off 4 mph on those (and the originals).  Now with
215/75/15s the speedo is pretty much exactly right on.  The
new tires are 27.8" diameter

Richard