GarageCalc What 175/65R14 means
175 is the section width in millimeters (6.9 in). 65 is the aspect ratio: the sidewall is 65 percent of the width, so 175 × 0.65 = 114 mm (4.5 in). R is radial construction, and 14 is the wheel diameter in inches (356 mm). Stack two sidewalls on the wheel and you get the overall diameter: 356 + 2 × 114 = 583 mm, or 23.0 in.
A full marking adds a load index and speed rating after the size, for example 175/65R14 91V. Those two codes set how much weight and speed the tire is certified for; look them up in the load index chart and the speed rating chart.
Plus and minus sizing from 175/65R14
Going up one wheel size, the closest match is 185/55R15 at +0.2% diameter with a 102 mm sidewall instead of 114 mm. Going down one size, 155/80R13 is -0.8% with a taller 124 mm sidewall for more comfort and pothole margin. Anything inside 3 percent keeps the speedometer, ABS and gearing effectively stock; the comparison calculator shows the full speedometer table for any pair.
Frequently asked questions
How tall is a 175/65R14 tire?
23.0 inches (583 mm) in overall diameter: the 14-inch wheel (356 mm) plus two 114 mm sidewalls. Real tires land within about 1 to 2 percent of that depending on brand, tread depth and pressure.
What is 175/65R14 in inches?
23.0 x 6.9 R14: 23.0 inches tall, 6.9 inches wide, on a 14-inch wheel. The sidewall is 4.5 inches and the circumference is 72.1 inches, so the tire turns 879 times per mile.
What tire sizes are equivalent to 175/65R14?
Within 3 percent of the same diameter on the same 14-inch wheel: 165/70R14 (+0.6%), 185/60R14 (-0.9%), 195/60R14 (+1.1%); on a 15-inch wheel: 185/55R15 (+0.2%), 165/60R15 (-0.7%); on a 13-inch wheel: 155/80R13 (-0.8%), 185/70R13 (+1.0%). The percentage is the diameter change, which is also your speedometer error.
Can I use 185/60R14 instead of 175/65R14?
Dimensionally yes: 185/60R14 is 0.9% shorter (-6 mm) and 10 mm wider, and at a true 60 mph the speedometer would read 60.6 mph. The extra width needs about 0.20 in of clearance on each side of the tire and a rim width that suits 185 mm.