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LT275/50R24 vs LT285/75R18 tire size comparison

LT275/50R24LT285/75R18

LT285/75R18 is 0.00 in (0.01%) taller than LT275/50R24 and 0.4 in wider. They fit different wheels: LT275/50R24 a 24-inch wheel and LT285/75R18 an 18-inch wheel.

LT275/50R24 and LT285/75R18 side by side

0.0 in / +0.01%LT275/50R24: 34.8 in tall, solid lineLT285/75R18: 34.8 in tall, dashed lineLT275/50R24Width 10.8 in (275 mm)Sidewall 5.4 in (138 mm)LT285/75R18Width 11.2 in (285 mm)Sidewall 8.4 in (214 mm)
LT275/50R24 is drawn with a solid line and LT285/75R18 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 LT275/50R24 and LT285/75R18, with the difference (LT285/75R18 minus LT275/50R24)
MeasurementLT275/50R24LT285/75R18DifferenceDifference %
Section width10.8 in (275 mm)11.2 in (285 mm)+0.4 in (+10 mm)+3.64%
Sidewall height5.4 in (138 mm)8.4 in (214 mm)+3.0 in (+76 mm)+55.45%
Wheel (rim) diameter24.0 in (610 mm)18.0 in (457 mm)-6.0 in (-153 mm)-25.00%
Overall diameter34.8 in (885 mm)34.8 in (885 mm)0.0 in (0 mm)+0.01%
Circumference109.4 in (2779 mm)109.4 in (2779 mm)0.0 in (0 mm)+0.01%
Revolutions per mile5795790-0.01%

Differences are LT285/75R18 minus LT275/50R24; percentages are relative to LT275/50R24. 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 LT275/50R24, the actual speed on LT285/75R18 is about 60.0 mph. When it reads 60 mph on a vehicle built for LT285/75R18, the actual speed on LT275/50R24 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, LT275/50R24 against LT285/75R18
Speedometer readsActual on LT285/75R18 (built for LT275/50R24)Actual on LT275/50R24 (built for LT285/75R18)
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.

Open this comparison in the calculator

Shop for LT275/50R24 or LT285/75R18 tires

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Other comparisons with LT275/50R24

Side-by-side dimensions and speedometer difference for sizes close to LT275/50R24 in overall diameter.

Other comparisons with LT285/75R18

Side-by-side dimensions and speedometer difference for sizes close to LT285/75R18 in overall diameter.

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