Biggest tire on 1969 dart

This site does good to let you put your measurements in and then see if your new wheel and tire combination will work. It may be set up for more modern vehicles but can be used with our older cars by using the correct measurements that are the same.
http://www.wheel-size.com/calc/?wheel1=205-55-16X6.5ET45&wheel2=225-45-17X7.5ET40&fcl=50mm&wcl=30mm&scl=50mm