How tall is a 420/85R34 tire?

A 420/85R34 has a nominal overall diameter of 62.12 inches (1578 mm), calculated as the 34-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 420/85R34 tire fit?

A 420/85R34 fits a wheel of 34 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 420/85R34 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). 34 is the wheel diameter in inches.

Size Dimensions & Specs

Tires Size 420/85R34

Dimensions, specs, and every size 420/85R34 tire currently in stock

Overall Height

62.12"

1578 mm · calculated

Section Width

420 mm

16.54 inches

Sidewall Height

14.06"

357 mm · 85% profile

Wheel Diameter

34"

863.6 mm

420/85R34 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)	62.12 in	1578 mm
Wheel / rim diameter	34 in	863.6 mm
Construction	Radial	—

What does 420/85R34 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

34 in

Fits a wheel measuring 34 inches across.

420/85R34 Questions & Answers

Dimensions and fitment guidelines for size 420/85R34

Tires Size 420/85R34

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Filter & search

420/85R34 Specifications

What does 420/85R34 mean?

420 mm

85% profile

Radial

34 in

420/85R34 Questions & Answers

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