GarageCalc What 275/60R15 means
275 is the section width in millimeters (10.8 in). 60 is the aspect ratio: the sidewall is 60 percent of the width, so 275 × 0.60 = 165 mm (6.5 in). R is radial construction, and 15 is the wheel diameter in inches (381 mm). Stack two sidewalls on the wheel and you get the overall diameter: 381 + 2 × 165 = 711 mm, or 28.0 in.
A full marking adds a load index and speed rating after the size, for example 275/60R15 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 275/60R15
Similar diameter does not establish interchangeability. Follow the vehicle manufacturer's approved sizes; see Michelin's tire-size guidance.
No common size on a 14 or 16-inch wheel stays within 3 percent of 28.0 in, so 275/60R15 is best replaced like for like. The comparison calculator compares nominal dimensions for any candidate.
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 275/60R15 tire?
28.0 inches (711 mm) in overall diameter: the 15-inch wheel (381 mm) plus two 165 mm sidewalls. Actual dimensions depend on the tire model, tread depth, pressure and load; check the tire manufacturer specifications.
What is 275/60R15 in inches?
28.0 x 10.8 R15: 28.0 inches tall, 10.8 inches wide, on a 15-inch wheel. The sidewall is 6.5 inches and the circumference is 87.9 inches, so the tire turns 720 times per mile.
What tire sizes are equivalent to 275/60R15?
No size in this limited comparison set falls within 3 percent of 28.0 inches. This is not an exhaustive list or a fitment approval.