185/65R14 tire size means:
185 = tire width in millimeters
65 = sidewall height is 65% of the tire width
R = radial tire construction
14 = rim diameter in inches
(Usually written as 185/65R14 — the extra “R” in “185/65RR14” is likely a typo.)
Approximate dimensions:
Sidewall height: 120 mm
Overall diameter: 596 mm (23.5 inches)
This is a common size for compact cars such as:
Toyota Corolla
Nissan Sunny
Honda Fit
Mazda Demio
It’s popular because it offers:
good fuel economy
comfortable ride
affordable tire prices
balanced handling for daily driving