What 185/60R14 means
The inputs are 185 mm nominal section width, a 60-percent aspect ratio, and a 14-inch nominal rim diameter. The R identifies radial construction. The width is not a wheel-width measurement, and the rim number is not the outside diameter of the tire.
Nominal sidewall height is 185 × 60 ÷ 100 = 111 mm. Adding two sidewalls to the 355.6 mm rim gives 577.6 mm (22.74 in) of nominal outside diameter.
A calculated reference
Two 111 mm sidewalls contribute 222 mm to the 577.6 mm overall result. Changing the display to inches converts this same model; it does not reinterpret the marking as an inch-based flotation size or alter the input units.
Using a perfect-circle model, circumference is 1814.58 mm, equivalent to 551.09 revolutions per kilometer or 886.89 per mile. These are derived from unrounded diameter; actual rolling circumference also depends on the product and operating conditions.
Source and scope
General Tire’s AltiMAX RT45 source includes 185/60R14, article 15576020000. It was checked on October 27, 2026. That record verifies the published marking used here; it does not turn these calculated dimensions into that product’s measured specification or establish availability.
Use the exact product and vehicle requirements for load and speed ratings, permitted rim dimensions, inflation and clearance. Nominal geometry alone cannot verify fitment, braking behavior, handling or safety.
Sources and further reading
- AltiMAX RT45 — General Tire
- Tire Markings Explained — Michelin
- Tire glossary — Michelin