Tire Size Cross-Reference

Letter-coded bias-ply sizes (1965–early 1980s) translate to modern radial sizes by overall diameter and load capacity. Match by overall diameter to keep speedometer calibration and gear ratios correct.

14" Wheels

Bias-Ply SizeClosest RadialOverall Diameter (approx.)
A78-14175/80R1425.0 in
B78-14185/80R1425.7 in
C78-14185/80R14 or 195/75R1425.7 in
D78-14195/75R1425.5 in

Register free to view the full bias-ply to radial cross-reference for 14" and 15" wheels plus speedometer-impact notes.