Home275/65R20 vs 35x12.50R20

275/65R20 vs 35x12.50R20

The 35x12.50R20 is 35.00 in tall: 0.93 in (2.7%) taller than the 275/65R20 at 34.07 in. At an indicated 60 mph you'd be doing 61.6 mph.The 35x12.50R20 is 889.0 mm tall: 23.5 mm (2.7%) taller than the 275/65R20 at 865.5 mm. At an indicated 100 km/h you'd be doing 102.7 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

The 35x12.50R20 is a flotation size: its 35.00 in height and 12.50 in width are the nominal numbers in the size code. The 275/65R20 is metric, 275 mm wide with each sidewall 65% of that, which works out at 34.07 in tall and 10.83 in wide. On paper the 35x12.50R20 is 0.93 in taller and 1.67 in wider.

Flotation sizes state their height and width in inches, and those numbers are nominal: makers aim at them, and real tires of the same size measure a little differently.

Makers' own measured diameters run 34.05 to 34.47 in for the 275/65R20 and 34.5 to 35.04 in for the 35x12.50R20, against the calculated 34.07 in and 35.00 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 275/65R20 reads low on the 35x12.50R20: an indicated 60 mph is a true 61.6 mph.A speedometer that read true on the 275/65R20 reads low on the 35x12.50R20: an indicated 100 km/h is a true 102.7 km/h.

The odometer records about 9,740 miles for every 10,000 you drive.The odometer records about 9,740 km for every 10,000 you drive.

Ground clearance and size class

Ground clearance at the axle rises by 0.46 in: half the diameter change, unloaded.Ground clearance at the axle rises by 11.8 mm: half the diameter change, unloaded. By calculated diameter the 275/65R20 is a 34-inch tire and the 35x12.50R20 a 35-inch tire.

See every 34-inch and 35-inch size in metric.

35x12.50R20 in metric.

Compare other sizes in the calculator