What is the diameter of a 180/65R39 tire?

A 180/65R39 tire has an overall diameter of 48.21 inches (1224.5mm).

How many revolutions per mile does a 180/65R39 tire make?

A 180/65R39 tire makes approximately 418 revolutions per mile.

What rim width is recommended for 180/65R39 tires?

The recommended wheel rim width for a 180/65R39 tire is 4.5" - 6.3".

180/65R39

Standard Metric

Factory Specs, Physical Dimensions & Compatible Vehicle Applications

Factory Spec Overview

The 180/65R39 tire size features an overall diameter of 48.21 inches, a section width of 7.1 inches (180mm), and rotates 418 times per mile. It is a standard factory tire fitment on 12+ vehicle models including Saab 900.

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Physical Dimensions & Specs

Overall Diameter

48.21"

1224.5 mm

Section Width

180 mm

7.09" wide

Sidewall Height

4.61"

117.1 mm (65% aspect)

Revolutions / Mile

418

Circumference: 151.46"

Rim Diameter

39"

Wheel size

Recommended Rim Width

4.5" - 6.3"

Optimal rim width range

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Speedometer & Alternate Size Calculator

Testing an alternate size for your vehicle? Compare 180/65R39 against any proposed tire size below:

Popular Comparisons:

Tire 1 (Stock / Base)180/65R39

Section Width (mm)

Aspect Ratio (%)

Rim Diameter (in)

Wheel Width (in)

Offset ET (mm)

Overall Height:48.2"

Sidewall:4.6"

Revs/Mile:418

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

-38.7%At 60 mph reading, actual speed is 36.8 mph

Indicated	Actual Speed	Diff
20 mph	12.3 mph	-7.7 mph
30 mph	18.4 mph	-11.6 mph
45 mph	27.6 mph	-17.4 mph
60 mph	36.8 mph	-23.2 mph
75 mph	46.0 mph	-29.0 mph
90 mph	55.2 mph	-34.8 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:-9.32" lower ground clearance

Vehicles That Fit 180/65R39 (12+ Models)

Factory standard and optional vehicle fitments utilizing 180/65R39 tires:

Year	Make & Model	Trim / Variant	Lookup Specs
1980	Saab 900	Base, 4D Hatchback	View 1980 900 ›
1980	Saab 900	Base, 2D Hatchback	View 1980 900 ›
1980	Saab 900	GLE, Standard Trans	View 1980 900 ›
1980	Saab 900	GLE, Automatic Trans	View 1980 900 ›
1981	Saab 900	Base, 2D Hatchback, 2.0L Eng VIN 4, Automatic Trans	View 1981 900 ›
1981	Saab 900	Base, 2D Hatchback, 2.0L Eng VIN 4, Standard Trans	View 1981 900 ›
1981	Saab 900	Base, 4D Sedan, Automatic Trans	View 1981 900 ›
1981	Saab 900	Base, 4D Sedan, Standard Trans	View 1981 900 ›
1981	Saab 900	S, 2D Hatchback, Standard Trans	View 1981 900 ›
1981	Saab 900	S, 2D Hatchback, Automatic Trans	View 1981 900 ›
1981	Saab 900	S, 4D Sedan, Automatic Trans	View 1981 900 ›
1981	Saab 900	S, 4D Sedan, Standard Trans	View 1981 900 ›