Home265/50R20 vs 275/55R20

265/50R20 vs 275/55R20

The 275/55R20 is 31.91 in tall: 1.48 in (4.9%) taller than the 265/50R20 at 30.43 in. At an indicated 60 mph you'd be doing 62.9 mph.The 275/55R20 is 810.5 mm tall: 37.5 mm (4.9%) taller than the 265/50R20 at 773.0 mm. At an indicated 100 km/h you'd be doing 104.9 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 (265/50 to 275/55). The 275/55R20 is 0.40 in wider, and each sidewall is 0.73 in taller, so it ends up 1.48 in taller overall.

Makers' own measured diameters run 30.47 to 30.5 in for the 265/50R20 and 31.89 to 32.13 in for the 275/55R20, against the calculated 30.43 in and 31.91 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 265/50R20 reads low on the 275/55R20: an indicated 60 mph is a true 62.9 mph.A speedometer that read true on the 265/50R20 reads low on the 275/55R20: an indicated 100 km/h is a true 104.9 km/h.

The odometer records about 9,540 miles for every 10,000 you drive.The odometer records about 9,540 km for every 10,000 you drive.

Ground clearance and size class

Ground clearance at the axle rises by 0.74 in: half the diameter change, unloaded.Ground clearance at the axle rises by 18.8 mm: half the diameter change, unloaded. By calculated diameter the 265/50R20 is a 30-inch tire and the 275/55R20 a 32-inch tire.

See every 32-inch size in metric.

Other comparisons with these sizes

• 275/55R20 vs 275/60R20
• 275/55R20 vs 285/55R20

Compare other sizes in the calculator