Just a data point.
Goodyear 808-029-090
25.0 x 4.5 x 15
D2209, made in Chile in 2002
LF, 6' 6 1/4", 78.25 roll out, 24.907 Dia.
RF, 6' 5 7/8", 77.875 roll out, 24.788 Dia.
D2284, made in USA in 2010
LR, 6' 6 3/8", 78.375 roll out, 24.947 Dia.
RR, 6' 6 1/2", 78.5 roll out, 24.987 Dia.
Just measured them +/- 1/16" at 60 PSI.