GarageCalc What 275/70R16 means
275 is the section width in millimeters (10.8 in). 70 is the aspect ratio: the sidewall is 70 percent of the width, so 275 × 0.70 = 193 mm (7.6 in). R is radial construction, and 16 is the wheel diameter in inches (406 mm). Stack two sidewalls on the wheel and you get the overall diameter: 406 + 2 × 193 = 791 mm, or 31.2 in.
A full marking adds a load index and speed rating after the size, for example 275/70R16 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 275/70R16
Similar diameter does not establish interchangeability. Follow the vehicle manufacturer's approved sizes; see Michelin's tire-size guidance.
Going up one wheel size, the closest match is 275/65R17 at -0.3% diameter with a 179 mm sidewall instead of 193 mm. No common 15-inch size stays within 3 percent either. The 3 percent cutoff is a comparison filter, not a fitment approval. Use vehicle-approved sizes and check rim width, load and speed ratings, and clearances. The comparison calculator shows the full speedometer table for any pair.
For the effect on road speed and distance, see our worked speedometer example. When maintaining this set, use the rotation pattern guide to check whether tire direction or different front and rear sizes restrict rotation.
Frequently asked questions
How tall is a 275/70R16 tire?
31.2 inches (791 mm) in overall diameter: the 16-inch wheel (406 mm) plus two 193 mm sidewalls. Actual dimensions depend on the tire model, tread depth, pressure and load; check the tire manufacturer specifications.
What is 275/70R16 in inches?
31.2 x 10.8 R16: 31.2 inches tall, 10.8 inches wide, on a 16-inch wheel. The sidewall is 7.6 inches and the circumference is 97.9 inches, so the tire turns 647 times per mile.
What tire sizes are equivalent to 275/70R16?
Within 3 percent of the same diameter on the same 16-inch wheel: 265/75R16 (+1.6%), 265/70R16 (-1.8%); on a 17-inch wheel: 275/65R17 (-0.3%), 255/70R17 (-0.3%). These are nominal diameter comparisons, not approved replacements. Check vehicle-approved sizes, rim width, load and speed ratings, and clearance before changing size.