GarageCalc What 185/60R13 means
185 is the section width in millimeters (7.3 in). 60 is the aspect ratio: the sidewall is 60 percent of the width, so 185 × 0.60 = 111 mm (4.4 in). R is radial construction, and 13 is the wheel diameter in inches (330 mm). Stack two sidewalls on the wheel and you get the overall diameter: 330 + 2 × 111 = 552 mm, or 21.7 in.
A full marking adds a load index and speed rating after the size, for example 185/60R13 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 185/60R13
Going up one wheel size, the closest match is 165/60R14 at +0.3% diameter with a 99 mm sidewall instead of 111 mm. No common 12-inch size stays within 3 percent either. 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 185/60R13 tire?
21.7 inches (552 mm) in overall diameter: the 13-inch wheel (330 mm) plus two 111 mm sidewalls. Real tires land within about 1 to 2 percent of that depending on brand, tread depth and pressure.
What is 185/60R13 in inches?
21.7 x 7.3 R13: 21.7 inches tall, 7.3 inches wide, on a 13-inch wheel. The sidewall is 4.4 inches and the circumference is 68.3 inches, so the tire turns 928 times per mile.
What tire sizes are equivalent to 185/60R13?
Within 3 percent of the same diameter on the same 13-inch wheel: 175/65R13 (+1.0%), 165/65R13 (-1.4%), 165/70R13 (+1.6%); on a 14-inch wheel: 165/60R14 (+0.3%), 185/55R14 (+1.2%). The percentage is the diameter change, which is also your speedometer error.