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255/35R20 vs 285/35R19 tire size comparison

255/35R20285/35R19

285/35R19 is 0.1 in (0.64%) shorter than 255/35R20 and 1.2 in wider. They fit different wheels: 255/35R20 a 20-inch wheel and 285/35R19 a 19-inch wheel.

255/35R20 and 285/35R19 side by side

-0.1 in / -0.64%255/35R20: 27.0 in tall, solid line285/35R19: 26.9 in tall, dashed line255/35R20Width 10.0 in (255 mm)Sidewall 3.5 in (89 mm)285/35R19Width 11.2 in (285 mm)Sidewall 3.9 in (100 mm)
255/35R20 is drawn with a solid line and 285/35R19 with a dashed line. In each drawing both tires are to the same scale; the tread shoulder and bead curves are simplified. The table below has the same numbers.
Dimensions of 255/35R20 and 285/35R19, with the difference (285/35R19 minus 255/35R20)
Measurement255/35R20285/35R19DifferenceDifference %
Section width10.0 in (255 mm)11.2 in (285 mm)+1.2 in (+30 mm)+11.76%
Sidewall height3.5 in (89 mm)3.9 in (100 mm)+0.4 in (+11 mm)+11.76%
Wheel (rim) diameter20.0 in (508 mm)19.0 in (483 mm)-1.0 in (-25 mm)-5.00%
Overall diameter27.0 in (687 mm)26.9 in (682 mm)-0.1 in (-5 mm)-0.64%
Circumference84.9 in (2157 mm)84.4 in (2143 mm)-0.5 in (-14 mm)-0.64%
Revolutions per mile746751+5+0.65%

Differences are 285/35R19 minus 255/35R20; percentages are relative to 255/35R20. These are nominal design dimensions. Real tires vary by brand, tread depth, wheel width, load and pressure.

The overall diameter differs by 0.64%, which is within the common 3% rule of thumb.

The rule of thumb keeps a replacement size within about 3% of the original overall diameter. It covers diameter only. It is not a fit, load or safety check, because width, wheel diameter, load capacity and clearance matter too. Confirm any size change with your vehicle's owner's manual or a tire professional.

Speedometer difference

When the speedometer reads 60 mph on a vehicle built for 255/35R20, the actual speed on 285/35R19 is about 59.6 mph. When it reads 60 mph on a vehicle built for 285/35R19, the actual speed on 255/35R20 is about 60.4 mph. These figures assume the speedometer is accurate on the original size and use nominal dimensions, so treat them as estimates.

Actual speed for a given speedometer reading, 255/35R20 against 285/35R19
Speedometer readsActual on 285/35R19 (built for 255/35R20)Actual on 255/35R20 (built for 285/35R19)
20 mph19.9 mph20.1 mph
30 mph29.8 mph30.2 mph
40 mph39.7 mph40.3 mph
50 mph49.7 mph50.3 mph
60 mph59.6 mph60.4 mph
70 mph69.6 mph70.5 mph
80 mph79.5 mph80.5 mph

A common rule of thumb is to keep a replacement size within about 3% of the original overall diameter. Check the tire placard on the driver's door jamb and your owner's manual for the sizes your vehicle was built for. Confirm any size change with your vehicle's owner's manual or a tire professional.

Which vehicles use each size?

These vehicles list the size among their verified sizes, by trim. Open one to see all of its sizes.

Check it in the calculator

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Shop for 255/35R20 or 285/35R19 tires

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Other comparisons with 255/35R20

Side-by-side dimensions and speedometer difference for sizes close to 255/35R20 in overall diameter.

Other comparisons with 285/35R19

Side-by-side dimensions and speedometer difference for sizes close to 285/35R19 in overall diameter.

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