Wrong Tires!

69_340_GTS said
Even easier:
Metric width/12.7, times the profile, and then add the rim size. Ex; 295/50-15s would be ((295mm/12.7)x50%)+15"= 26.6"

Yeah that only works on 50 series tires.
A theoretical 295/60-15would be in fact about 28.9", and
a 295/45-15 might in fact be 25.45