What 215/60R17 means
The inputs are 215 mm nominal section width, a 60-percent aspect ratio, and a 17-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 215 × 60 ÷ 100 = 129 mm. Adding two sidewalls to the 431.8 mm rim gives 689.8 mm (27.16 in) of nominal outside diameter.
A calculated reference
The rim term is 431.8 mm and the two sidewalls total 258 mm. Together they produce the 689.8 mm diameter. The page’s circumference is π times that result, rather than a loaded rolling measurement from a tire manufacturer.
Using a perfect-circle model, circumference is 2167.07 mm, equivalent to 461.45 revolutions per kilometer or 742.64 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 215/60R17, article 15576310000. 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