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225/50R18 vs 285/35R19 tire size comparison

225/50R18285/35R19

285/35R19 is 0.00 in (0.01%) shorter than 225/50R18 and 2.3 in wider. They fit different wheels: 225/50R18 an 18-inch wheel and 285/35R19 a 19-inch wheel.

225/50R18 and 285/35R19 side by side

0.0 in / -0.01%225/50R18: 26.9 in tall, solid line285/35R19: 26.9 in tall, dashed line225/50R18Width 8.9 in (225 mm)Sidewall 4.4 in (113 mm)285/35R19Width 11.2 in (285 mm)Sidewall 3.9 in (100 mm)
225/50R18 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 225/50R18 and 285/35R19, with the difference (285/35R19 minus 225/50R18)
Measurement225/50R18285/35R19DifferenceDifference %
Section width8.9 in (225 mm)11.2 in (285 mm)+2.3 in (+60 mm)+26.67%
Sidewall height4.4 in (113 mm)3.9 in (100 mm)-0.5 in (-13 mm)-11.33%
Wheel (rim) diameter18.0 in (457 mm)19.0 in (483 mm)+1.0 in (+26 mm)+5.56%
Overall diameter26.9 in (682 mm)26.9 in (682 mm)0.0 in (0 mm)-0.01%
Circumference84.4 in (2143 mm)84.4 in (2143 mm)0.0 in (0 mm)-0.01%
Revolutions per mile7517510+0.01%

Differences are 285/35R19 minus 225/50R18; percentages are relative to 225/50R18. These are nominal design dimensions. Real tires vary by brand, tread depth, wheel width, load and pressure.

The overall diameter differs by 0.01%, 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 225/50R18, the actual speed on 285/35R19 is about 60.0 mph. When it reads 60 mph on a vehicle built for 285/35R19, the actual speed on 225/50R18 is about 60.0 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, 225/50R18 against 285/35R19
Speedometer readsActual on 285/35R19 (built for 225/50R18)Actual on 225/50R18 (built for 285/35R19)
20 mph20.0 mph20.0 mph
30 mph30.0 mph30.0 mph
40 mph40.0 mph40.0 mph
50 mph50.0 mph50.0 mph
60 mph60.0 mph60.0 mph
70 mph70.0 mph70.0 mph
80 mph80.0 mph80.0 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

The calculator takes the same two sizes and shows the full comparison, or lets you swap either one for another size.

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Shop for 225/50R18 or 285/35R19 tires

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Other comparisons with 225/50R18

Side-by-side dimensions and speedometer difference for sizes close to 225/50R18 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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