185/65R15 tire size in inches

Nominal 185/65R15 dimensions

Overall diameter

24.47 in621.5 mm

Section width

7.28 in185 mm

Sidewall height

4.73 in120.3 mm

Circumference

76.87 in1,952.5 mm

Rim diameter

15 in

Revolutions per mile

824nominal, from geometric circumference

Inch notation

24.5x7.3R15approximate

Where 185/65R15 fits

• Inch class: 24.47 in is near the top of the 24-inch class (23.50 to 24.49 in), so some listings call it a 25-inch tire.
• Profile: the 15-inch rim plus two 4.73 in sidewalls make up the overall diameter, and the sidewalls are 39% of it. At 65 series that is a tall profile: the extra sidewall absorbs more of each bump and flexes more in corners.
• Same 15-inch rim: the next taller catalog size is 205/60R15 (24.69 in, +0.88%) and the next shorter is 195/60R15 (24.21 in, -1.05%).
• Same 185 mm width: 185/70R14 (24.20 in, -1.11%). At the same width, a different profile or rim changes sidewall height and overall diameter, not section width.

Reading the marking: 185 is the section width in millimeters, 65 is the sidewall height as a percentage of that width, and R15 means radial construction for a 15-inch rim. Percentages are measured from 185/65R15.

Similar sizes on other rim diameters

Within 3% of 185/65R15's overall diameter, nearest first. The speed column is the actual speed when a speedometer calibrated for 185/65R15 reads 60 mph.

For a size without a comparison page, open 185/65R15 in the calculator and enter that size as the proposed tire.

Important: These results compare nominal dimensions. They do not confirm vehicle fitment. Actual clearance varies by tire model, approved rim width, wheel construction, suspension, alignment, body tolerances, steering angle, load, and brake geometry. Verify load and speed ratings and physically test-fit the complete setup before driving.

Physical checks before changing size

• Approved rim-width range for the exact tire model
• Load index and speed rating equal to or greater than vehicle requirements
• Brake-caliper, hub, and wheel-fastener compatibility
• Fender, liner, suspension, and full-lock steering clearance
• Clearance at full compression and under expected load
• Alignment, tire pressure, and manufacturer guidance
• Professional inspection when variance or clearance is uncertain

Published comparisons for 185/65R15

2 of 3 keep the 15-inch rim. Diameter changes are measured from 185/65R15.