JCleary said:How are you reading revs per mile? My Smarty will only tell tire size. When it took my settings back to stock to upload a Smarty update ( and after setting the tire size and verifying speeds with a buddy's GPS), it stated that the tire size is 31. 75" when I reloaded the new version. I was kind of annoyed.
This time I measured my tire height and programmed 33. 25", but I can only hope it's correct. I did not note the setting when I had the GPS to verify speed. I don't have a GPS to verify speed.
I'd much rather be able to play with revs per mile.
One other thing I noticed, but probably not related to the Smarty- If I have the speedo dead-on at 70mph, it will still read 2-3mph high at 35. Weird.
The ABS RPM 605 or 636 were the entries made with and read on the DRBIII tool. The Smarty does seem to convert the RPM to nn. nn inches for displaying and for entering. I am assuming the formula for converting inches into RPM is in the Smarty software. The Dodge Power Wagon 285 tire on the BFG site says 32. 70 inches in diameter. That is what I put into the Smarty. The Dealer used the 636 revpermile number off of the same spec sheet.