285/65R18 Tire Size Specifications

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Tire Dimensions & Specifications

Metric Specifications

Tire Size:
285/65R18
Width:
285 mm
Aspect Ratio:
65%
Wheel Size:
18 inches
Sidewall Height:
185 mm
Overall Diameter:
828 mm
Circumference:
2600 mm

Imperial Specifications

Flotation Size:
32.6x11.2R18
Width:
11.2 inches
Sidewall Height:
7.3 inches
Overall Diameter:
32.6 inches
Circumference:
102.4 inches
Revs per Mile:
619
Revs per Km:
385
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Alternative Tire Sizes for 18" Wheels

Other tire sizes that fit on 18" wheels

Tire SizeDiameterWidthDifference
255/50R1828.0"10.0"-14.0%
235/55R1828.2"9.3"-13.5%
165/80R18Spare28.4"6.5"-12.9%
225/60R1828.6"8.9"-12.1%
245/55R1828.6"9.6"-12.2%
155/90R18Spare29.0"6.1"-11.1%
215/65R1829.0"8.5"-11.0%
255/55R1829.0"10.0"-10.9%
235/60R1829.1"9.3"-10.7%
225/65R1829.5"8.9"-9.4%

Understanding 285/65R18 Tire Size Format

The tire size 285/65R18 follows the standard metric format used by most passenger vehicles:

285 / 65 R 18
285
Section width in millimeters
65
Aspect ratio (height as % of width)
R
Radial construction
18
Wheel diameter in inches

Flotation Format Equivalent

This tire size can also be expressed in flotation format as 32.6x11.2R18, where 32.6" is the overall diameter and 11.2" is the section width.