Travis, the tractor is actually a 1965 110, not a 1966. Notice the collared front spindles, the flat hitch, and the serial number plate located between the dash mount bolts instead of below the bolts. I can also see that the type code on the serial plate is marked as 110 instead of SNT.
Brian, since this is a 1965, the serial number break down that you have shown won't be any good in determining the tire size, as John Deere didn't start designating the ties sizes until 1966. Sorry buddy!
Edited by johndeereelfman, July 22, 2014 - 05:11 PM.