How tall is a 315/20ZR30 tire?

A 315/20ZR30 has a nominal overall diameter of 34.96 inches (888 mm), calculated as the 30-inch wheel plus two sidewalls. This is the unloaded figure — a fitted tire sits fractionally shorter under the weight of the vehicle.

What wheel size does a 315/20ZR30 tire fit?

A 315/20ZR30 fits a wheel of 30 inches in diameter. The wheel also has to be within the rim width range the manufacturer publishes for this size, which is printed in the tire's spec sheet.

What do the numbers in 315/20ZR30 mean?

315 is the section width in millimetres. 20 is the aspect ratio — the sidewall is 20% of the width, so 63 mm here. ZR marks the construction (radial). 30 is the wheel diameter in inches.

Size Dimensions & Specs

Tires Size 315/20ZR30

Dimensions, specs, and every size 315/20ZR30 tire currently in stock

Overall Height

34.96"

888 mm · calculated

Section Width

315 mm

12.4 inches

Sidewall Height

2.48"

63 mm · 20% profile

Wheel Diameter

30"

762.0 mm

315/20ZR30 Specifications

Read directly from the size code. Load index, speed rating, and rim width range vary by model.

Specification	Imperial	Metric
Section width	12.4 in	315 mm
Aspect ratio	20%	—
Sidewall height	2.48 in	63 mm
Overall diameter (calculated)	34.96 in	888 mm
Wheel / rim diameter	30 in	762.0 mm
Construction	Radial	—

What does 315/20ZR30 mean?

Reading the code on your sidewall

Section width

315 mm

The distance from sidewall to sidewall across the tire's widest point.

Aspect ratio

20% profile

The sidewall stands 20% of the section width, which is 63 mm on this size.

Construction (ZR)

Radial

The body plies run across the tire at right angles to the direction of travel.

Wheel diameter

30 in

Fits a wheel measuring 30 inches across.

315/20ZR30 Questions & Answers

Dimensions and fitment guidelines for size 315/20ZR30

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