255/70R16 tire size in inches

Nominal 255/70R16 dimensions

Overall diameter

30.06 in763.4 mm

Section width

10.04 in255 mm

Sidewall height

7.03 in178.5 mm

Circumference

94.42 in2,398.3 mm

Rim diameter

16 in

Revolutions per mile

671nominal, from geometric circumference

Inch notation

30.1x10.0R16approximate

Where 255/70R16 fits

• Inch class: 30.06 in is within 0.1 in of a true 30 inches, so the 30-inch label is close to exact.
• Profile: the 16-inch rim plus two 7.03 in sidewalls make up the overall diameter, and the sidewalls are 47% of it. At 70 series that is a tall profile: the extra sidewall absorbs more of each bump and flexes more in corners.
• Same 16-inch rim: the next taller catalog size is 215/85R16 (30.39 in, +1.11%) and the next shorter is 235/75R16 (29.88 in, -0.59%).
• Same 255 mm width: the closest in diameter are 255/70R15 (29.06 in, -3.33%), 255/65R17 (30.05 in, -0.01%), 255/65R18 (31.05 in, +3.31%), 255/70R17 (31.06 in, +3.33%). At the same width, a different profile or rim changes sidewall height and overall diameter, not section width.

Reading the marking: 255 is the section width in millimeters, 70 is the sidewall height as a percentage of that width, and R16 means radial construction for a 16-inch rim. Percentages are measured from 255/70R16.

Similar sizes on other rim diameters

Within 3% of 255/70R16's overall diameter, nearest first. The speed column is the actual speed when a speedometer calibrated for 255/70R16 reads 60 mph.

For a size without a comparison page, open 255/70R16 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 255/70R16

All keep the 16-inch rim. Diameter changes are measured from 255/70R16.