How tall is a 420/85R28 tire?

A 420/85R28 has a nominal overall diameter of 56.12 inches (1425 mm), calculated as the 28-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 420/85R28 tire fit?

A 420/85R28 fits a wheel of 28 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 420/85R28 mean?

420 is the section width in millimetres. 85 is the aspect ratio — the sidewall is 85% of the width, so 357 mm here. R marks the construction (radial). 28 is the wheel diameter in inches.

Size Dimensions & Specs

Tires Size 420/85R28

Dimensions, specs, and every size 420/85R28 tire currently in stock

Overall Height

56.12"

1425 mm · calculated

Section Width

420 mm

16.54 inches

Sidewall Height

14.06"

357 mm · 85% profile

Wheel Diameter

28"

711.2 mm

420/85R28 Specifications

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

Specification	Imperial	Metric
Section width	16.54 in	420 mm
Aspect ratio	85%	—
Sidewall height	14.06 in	357 mm
Overall diameter (calculated)	56.12 in	1425 mm
Wheel / rim diameter	28 in	711.2 mm
Construction	Radial	—

What does 420/85R28 mean?

Reading the code on your sidewall

Section width

420 mm

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

Aspect ratio

85% profile

The sidewall stands 85% of the section width, which is 357 mm on this size.

Construction (R)

Radial

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

Wheel diameter

28 in

Fits a wheel measuring 28 inches across.

420/85R28 Questions & Answers

Dimensions and fitment guidelines for size 420/85R28

Tires Size 420/85R28

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Filter & search

420/85R28 Specifications

What does 420/85R28 mean?

420 mm

85% profile

Radial

28 in

420/85R28 Questions & Answers

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