Hey DocDave,
Could not resist the bigger shoes he???
Gotta love it!!
With those big tirese you should get some deviation from the speedo and odo readings...nothing to be concerned about though. If you really want to find out what the speed difference is go to the local "cop shop" and have then do a radar calibration on the VX with the new tires. That's what I did with my old Chevy Blazer and found out there was a 5 mph difference to actual reading.
John