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265/70R18 vs 275/70R18

The 275/70R18 is 33.16 in tall: 0.55 in (1.7%) taller than the 265/70R18 at 32.61 in. At an indicated 60 mph you'd be doing 61.0 mph.The 275/70R18 is 842.2 mm tall: 14.0 mm (1.7%) taller than the 265/70R18 at 828.2 mm. At an indicated 100 km/h you'd be doing 101.7 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 0.28 in, and the 275/70R18 ends up 0.55 in taller overall.

Makers' own measured diameters run 32.6 to 32.87 in for the 265/70R18 and 33.19 to 33.62 in for the 275/70R18, against the calculated 32.61 in and 33.16 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 265/70R18 reads low on the 275/70R18: an indicated 60 mph is a true 61.0 mph.A speedometer that read true on the 265/70R18 reads low on the 275/70R18: an indicated 100 km/h is a true 101.7 km/h.

The odometer records about 9,830 miles for every 10,000 you drive.The odometer records about 9,830 km for every 10,000 you drive.

Ground clearance and size class

Ground clearance at the axle rises by 0.28 in: half the diameter change, unloaded.Ground clearance at the axle rises by 7.0 mm: half the diameter change, unloaded. By calculated diameter both are 33-inch tires.

See every 33-inch size in metric.

Same change, other sizes

The same change in diameter, width and sidewall has its own page: 265/70R17 vs 275/70R17.

Other comparisons with these sizes

• 275/70R18 vs 285/65R18

275/70R18 in inches.

Compare other sizes in the calculator