Home285/70R17 vs 285/75R17

285/70R17 vs 285/75R17

The 285/75R17 is 33.83 in tall: 1.12 in (3.4%) taller than the 285/70R17 at 32.71 in. At an indicated 60 mph you'd be doing 62.1 mph.The 285/75R17 is 859.3 mm tall: 28.5 mm (3.4%) taller than the 285/70R17 at 830.8 mm. At an indicated 100 km/h you'd be doing 103.4 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 width stays at 11.22 in; the aspect ratio goes from 70 to 75. Each sidewall goes from 7.85 in to 8.42 in, and with one sidewall above the wheel and one below, the overall diameter goes from 32.71 in to 33.83 in.

Makers' own measured diameters run 32.76 to 33.15 in for the 285/70R17 and 33.86 to 34.09 in for the 285/75R17, against the calculated 32.71 in and 33.83 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 285/75R17: an indicated 60 mph is a true 62.1 mph.A speedometer that read true on the 285/70R17 reads low on the 285/75R17: an indicated 100 km/h is a true 103.4 km/h.

The odometer records about 9,670 miles for every 10,000 you drive.The odometer records about 9,670 km for every 10,000 you drive.

Ground clearance and size class

Ground clearance at the axle rises by 0.56 in: half the diameter change, unloaded.Ground clearance at the axle rises by 14.3 mm: half the diameter change, unloaded. By calculated diameter the 285/70R17 is a 33-inch tire and the 285/75R17 a 34-inch tire.

See every 33-inch and 34-inch size in metric.

Same change, other sizes

One other searched pair makes the same change in diameter, width and sidewall:

• 285/65R18 vs 285/70R18

Other comparisons with these sizes

• 265/70R17 vs 285/70R17
• 265/70R17 vs 285/75R17
• 285/70R17 vs 315/70R17
• 285/70R17 vs 33x12.50R17

285/70R17 in inches. 285/75R17 in inches.

Compare other sizes in the calculator