What is the diameter of a 285/50R18 tire?

A 285/50R18 tire has an overall diameter of 29.22 inches (742.2mm).

How many revolutions per mile does a 285/50R18 tire make?

A 285/50R18 tire makes approximately 690 revolutions per mile.

What rim width is recommended for 285/50R18 tires?

The recommended wheel rim width for a 285/50R18 tire is 7.1" - 10".

285/50R18

Standard Metric

Factory Specs, Physical Dimensions & Compatible Vehicle Applications

Factory Spec Overview

The 285/50R18 tire size features an overall diameter of 29.22 inches, a section width of 11.2 inches (285mm), and rotates 690 times per mile. It is a standard factory tire fitment on 4+ vehicle models including Mercedes-Benz ML55.

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Physical Dimensions & Specs

Overall Diameter

29.22"

742.2 mm

Section Width

285 mm

11.22" wide

Sidewall Height

5.61"

142.5 mm (50% aspect)

Revolutions / Mile

690

Circumference: 91.8"

Rim Diameter

18"

Wheel size

Recommended Rim Width

7.1" - 10"

Optimal rim width range

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Speedometer & Alternate Size Calculator

Testing an alternate size for your vehicle? Compare 285/50R18 against any proposed tire size below:

Popular Comparisons:

Tire 1 (Stock / Base)285/50R18

Section Width (mm)

Aspect Ratio (%)

Rim Diameter (in)

Wheel Width (in)

Offset ET (mm)

Overall Height:29.2"

Sidewall:5.6"

Revs/Mile:690

Tire 2 (New / Compare)245/60R18

Section Width (mm)

Aspect Ratio (%)

Rim Diameter (in)

Wheel Width (in)

Offset ET (mm)

Overall Height:29.6"

Sidewall:5.8"

Revs/Mile:682

Visual Tire & Wheel Comparison

Speedometer Variance

+1.2%At 60 mph reading, actual speed is 60.7 mph

Indicated	Actual Speed	Diff
20 mph	20.2 mph	+0.2 mph
30 mph	30.4 mph	+0.4 mph
45 mph	45.5 mph	+0.5 mph
60 mph	60.7 mph	+0.7 mph
75 mph	75.9 mph	+0.9 mph
90 mph	91.1 mph	+1.1 mph

Fender & Suspension Clearance

Fitment Status: MODERATE RISK

Flush fitment. Extends 17.7mm outwards. Check wheel arch clearance under full suspension compression.

Inner Strut Space:7.7mm LESS clearance

Outer Fender Push:Extends 17.7mm further out

Ride Height Delta:+0.18" ground clearance

Vehicles That Fit 285/50R18 (4+ Models)

Factory standard and optional vehicle fitments utilizing 285/50R18 tires:

Year	Make & Model	Trim / Variant	Lookup Specs
2000	Mercedes-Benz ML55	ML55	View 2000 ML55 ›
2001	Mercedes-Benz ML55	ML55	View 2001 ML55 ›
2002	Mercedes-Benz ML55	ML55	View 2002 ML55 ›
2003	Mercedes-Benz ML55	ML55	View 2003 ML55 ›