Home285/70R17 vs 33x12.50R17

285/70R17 vs 33x12.50R17

The 33x12.50R17 is 33.00 in tall: 0.29 in (0.9%) taller than the 285/70R17 at 32.71 in. At an indicated 60 mph you'd be doing 60.5 mph.The 33x12.50R17 is 838.2 mm tall: 7.4 mm (0.9%) taller than the 285/70R17 at 830.8 mm. At an indicated 100 km/h you'd be doing 100.9 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

The 33x12.50R17 is a flotation size: its 33.00 in height and 12.50 in width are the nominal numbers in the size code. The 285/70R17 is metric, 285 mm wide with each sidewall 70% of that, which works out at 32.71 in tall and 11.22 in wide. On paper the 33x12.50R17 is 0.29 in taller and 1.28 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 32.76 to 33.15 in for the 285/70R17 and 32.52 to 32.76 in for the 33x12.50R17, against the calculated 32.71 in and 33.00 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 285/70R17 reads low on the 33x12.50R17: an indicated 60 mph is a true 60.5 mph.A speedometer that read true on the 285/70R17 reads low on the 33x12.50R17: an indicated 100 km/h is a true 100.9 km/h.

The odometer records about 9,910 miles for every 10,000 you drive.The odometer records about 9,910 km for every 10,000 you drive.

Ground clearance and size class

Ground clearance at the axle rises by 0.15 in: half the diameter change, unloaded.Ground clearance at the axle rises by 3.7 mm: half the diameter change, unloaded. By calculated diameter both are 33-inch tires.

See every 33-inch size in metric.

Other comparisons with these sizes

• 265/70R17 vs 285/70R17
• 285/70R17 vs 285/75R17
• 285/70R17 vs 315/70R17

285/70R17 in inches. 33x12.50R17 in metric.

Compare other sizes in the calculator