Home265/65R18 vs 275/65R18

265/65R18 vs 275/65R18

The 275/65R18 is 32.07 in tall: 0.51 in (1.6%) taller than the 265/65R18 at 31.56 in. At an indicated 60 mph you'd be doing 61.0 mph.The 275/65R18 is 814.7 mm tall: 13.0 mm (1.6%) taller than the 265/65R18 at 801.7 mm. At an indicated 100 km/h you'd be doing 101.6 km/h.

By David Owen.

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

Only the section width changes, from 10.43 in to 10.83 in. The aspect ratio is a percentage of the width, so each sidewall grows with it, by 0.26 in, and the 275/65R18 ends up 0.51 in taller overall.

Makers' own measured diameters run 31.5 to 31.6 in for the 265/65R18 and 32.09 to 32.32 in for the 275/65R18, against the calculated 31.56 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 265/65R18 reads low on the 275/65R18: an indicated 60 mph is a true 61.0 mph.A speedometer that read true on the 265/65R18 reads low on the 275/65R18: an indicated 100 km/h is a true 101.6 km/h.

The odometer records about 9,840 miles for every 10,000 you drive.The odometer records about 9,840 km for every 10,000 you drive.

Ground clearance and size class

Ground clearance at the axle rises by 0.26 in: half the diameter change, unloaded.Ground clearance at the axle rises by 6.5 mm: half the diameter change, unloaded. By calculated diameter both are 32-inch tires.

See every 32-inch size in metric.

Same change, other sizes

The same change in diameter, width and sidewall has its own page: 275/65R18 vs 285/65R18.

Other comparisons with these sizes

• 275/65R18 vs 285/65R18
• 265/60R18 vs 275/65R18

Compare other sizes in the calculator