Home265/60R18 vs 275/65R18

265/60R18 vs 275/65R18

The 275/65R18 is 32.07 in tall: 1.55 in (5.1%) taller than the 265/60R18 at 30.52 in. At an indicated 60 mph you'd be doing 63.1 mph.The 275/65R18 is 814.7 mm tall: 39.5 mm (5.1%) taller than the 265/60R18 at 775.2 mm. At an indicated 100 km/h you'd be doing 105.1 km/h.

By David Owen. Published 3 November 2026.

in, mphmm, km/h

Each figure is rounded separately, so related figures can differ in the last digit.

These are size-code figures only. Whether a size fits, clears and carries your load depends on your vehicle and the tire, so check with a tire shop.

What changes

Width and aspect ratio both change (265/60 to 275/65). The 275/65R18 is 0.40 in wider, and each sidewall is 0.78 in taller, so it ends up 1.55 in taller overall.

Makers' own measured diameters run 30.5 to 30.60 in for the 265/60R18 and 32.09 to 32.32 in for the 275/65R18, against the calculated 30.52 in and 32.07 in. Real tires vary by brand and tread design; the figures in the table come from the size code alone.

Speedometer and odometer

A speedometer that read true on the 265/60R18 reads low on the 275/65R18: an indicated 60 mph is a true 63.1 mph.A speedometer that read true on the 265/60R18 reads low on the 275/65R18: an indicated 100 km/h is a true 105.1 km/h.

The odometer records about 9,520 miles for every 10,000 you drive.The odometer records about 9,520 km for every 10,000 you drive.

Ground clearance and size class

Ground clearance at the axle rises by 0.78 in: half the diameter change, unloaded.Ground clearance at the axle rises by 19.8 mm: half the diameter change, unloaded. By calculated diameter the 265/60R18 is a 31-inch tire and the 275/65R18 a 32-inch tire.

See every 31-inch and 32-inch size in metric.

Other comparisons with these sizes

• 275/65R18 vs 285/65R18

Compare other sizes in the calculator