What is the diameter of a P275/55R18 tire?

A P275/55R18 tire has an overall diameter of 29.91 inches (759.7mm).

How many revolutions per mile does a P275/55R18 tire make?

A P275/55R18 tire makes approximately 674 revolutions per mile.

What rim width is recommended for P275/55R18 tires?

The recommended wheel rim width for a P275/55R18 tire is 6.9" - 9.6".

P275/55R18

Passenger / P-Metric

Factory Specs, Physical Dimensions & Compatible Vehicle Applications

Factory Spec Overview

The P275/55R18 tire size features an overall diameter of 29.91 inches, a section width of 10.8 inches (275mm), and rotates 674 times per mile. It is a standard factory tire fitment on 1+ vehicle models including Lincoln Blackwood.

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Physical Dimensions & Specs

Overall Diameter

29.91"

759.7 mm

Section Width

275 mm

10.83" wide

Sidewall Height

5.95"

151.1 mm (55% aspect)

Revolutions / Mile

674

Circumference: 93.96"

Rim Diameter

18"

Wheel size

Recommended Rim Width

6.9" - 9.6"

Optimal rim width range

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Speedometer & Alternate Size Calculator

Testing an alternate size for your vehicle? Compare P275/55R18 against any proposed tire size below:

Popular Comparisons:

Tire 1 (Stock / Base)275/55R18

Section Width (mm)

Aspect Ratio (%)

Rim Diameter (in)

Wheel Width (in)

Offset ET (mm)

Overall Height:29.9"

Sidewall:6.0"

Revs/Mile:674

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

-1.1%At 60 mph reading, actual speed is 59.3 mph

Indicated	Actual Speed	Diff
20 mph	19.8 mph	-0.2 mph
30 mph	29.7 mph	-0.3 mph
45 mph	44.5 mph	-0.5 mph
60 mph	59.3 mph	-0.7 mph
75 mph	74.2 mph	-0.8 mph
90 mph	89.0 mph	-1.0 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:-0.17" lower ground clearance

Vehicles That Fit P275/55R18 (1+ Models)

Factory standard and optional vehicle fitments utilizing P275/55R18 tires:

Year	Make & Model	Trim / Variant	Lookup Specs
2002	Lincoln Blackwood	Blackwood	View 2002 Blackwood ›