What does 275/65R18 mean?

The code specifies a 275 mm section width, a 65% aspect ratio, and a 18.0-inch rim diameter.

What is the overall diameter of the 275/65R18 Tire?

Its overall diameter is about 815.0 mm, with a circumference of 2560.4 mm.

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275/65R18 Tire Size & Dimensions

Tires

Official Confirmed Size

The 275/65R18 Tire has a section width of 275.0 mm ( 10.83 in), a 178.9 mm sidewall, and an overall diameter of 815.0 mm ( 32.09 in). It rolls 2560.4 mm per revolution. It weighs 23.00 kg (50.71 lb).

Exact Dimensions

275/65R18 Tire exact dimensions in millimeters and inches
Dimension	Metric	Imperial
Section width	275.0 mm	10.83 in
Sidewall height	178.9 mm	7.04 in
Overall diameter	815.0 mm	32.09 in
Rim diameter	457.2 mm	18.00 in
Circumference	2560.4 mm	100.80 in
Revolutions per mile	628.6	628.6
Weight	23.00 kg	50.71 lb

Calculate another tire sizeCompare diameter, circumference, clearance change, and speedometer impact for a replacement tire.

Size in Context

The 275/65R18 Tire has a section width of 275.0 mm, a sidewall height of 178.9 mm, and an overall diameter of 815.0 mm. Each revolution covers about 2560.4 mm. It weighs about 23.00 kg.

The 275/65R18 Tire is a vehicle component, so its outer diameter, width, and profile describe the space it needs rather than a pocket or desk footprint.

At 23.00 kg, the 275/65R18 Tire has the substantial feel expected of a vehicle component; size and weight both matter for fit and handling.