275/60R20 in inches & centimeters

275/60R20 has a nominal diameter of 32.99 inches and width of 10.83 inches, with a 6.50-inch sidewall on a 20-inch wheel. Nominal tire dimensions calculated directly from the size code. Use these numbers to compare geometry before checking the actual tire specification.

≈ 32.99 × 10.83R20 in — nominal inch notation. Check the tire maker’s catalog for available product sizes.

Overall diameter32.99 in83.80 cm838.00 mm

Section width10.83 in27.50 cm275.00 mm

Sidewall height6.50 in16.50 cm165.00 mm

Circumference103.65 in263.27 cm2,632.65 mm

Wheel diameter20.00 in50.80 cm508.00 mm

Measurement	inches	centimeters	millimeters
Overall diameter	32.99 in	83.80 cm	838.0 mm
Section width	10.83 in	27.50 cm	275.0 mm
Sidewall height	6.50 in	16.50 cm	165.0 mm
Circumference	103.65 in	263.27 cm	2,632.7 mm
Wheel diameter	20.00 in	50.80 cm	508.0 mm
Revolutions / mi	611.3
Revolutions / km	379.8

Compare this size

Nominal dimensions · 275/60R20

Side view

DOverall diameter32.99 in83.80 cm

SSidewall height6.50 in16.50 cm

WDWheel diameter20.00 in50.80 cm

Front view

DOverall diameter32.99 in83.80 cm

WSection width10.83 in27.50 cm

DOverall diameter: 32.99 in83.80 cm
WSection width: 10.83 in27.50 cm
SSidewall height: 6.50 in16.50 cm
WDWheel diameter: 20.00 in50.80 cm
CCircumference: 103.65 in263.27 cm

Photorealistic illustration. Generic tread and wheel; dimensions are calculated from the size code.

Approximate inch notation≈ 32.99 × 10.83R20

Diameter × width, with wheel diameter in inches, derived from the nominal size code. Use the tire maker’s catalog to choose an available product size.

Add a second size to compare dimensions and speedometer change.

Workshop photograph of a Sunwide Durevole A/T tire on a Silverado, with the 275/60R20 115T sidewall code visible on the left — **Sunwide Durevole A/T · 275/60R20 115T**
Installed example with a 275/60R20 115T sidewall code.

Front product view showing the tread channels and shoulder blocks of an ExtremeContact Sport 02 tire — **Continental ExtremeContact Sport 02**
Tread-detail reference. Section width is calculated separately.
Product image: Continental Tire

How we calculate it

275 = section width in millimeters; 60 = sidewall as a percentage of width; 20 = wheel diameter in inches.

Sidewall height: 275 × 60/100 = 165 mm
Overall diameter: (20 × 25.4) + (2 × 165) = 838 mm
Circumference: π × 838 ≈ 2,632.7 mm

Read the size-code guide

What to check before changing size

Use the vehicle and tire specifications to check these three points:

Vehicle placard and manual: match an approved size and the required load and speed ratings.
Wheel specifications: check the tire maker’s wheel-width range and the wheel offset.
Available space: check clearance at full steering lock and throughout suspension travel.

Method / data

Dimensions are calculated from the nominal size code. The reference catalog lists size codes; the tire maker’s specification sheet gives the exact model’s published measurements.

Calculation method and reference data

Nearby sizes to explore

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265/60R20Overall diameter32.52 in82.60 cm-1.43% overall diameterCompare tires

285/60R20Overall diameter33.46 in85.00 cm+1.43% overall diameterCompare tires

285/55R20Overall diameter32.34 in82.15 cm-1.97% overall diameterCompare tires

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