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.
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.