How tall is a 255/40ZR19 tire?

A 255/40ZR19 has a nominal overall diameter of 27.04 inches (687 mm), calculated as the 19-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 255/40ZR19 tire fit?

A 255/40ZR19 fits a wheel of 19 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 255/40ZR19 mean?

255 is the section width in millimetres. 40 is the aspect ratio — the sidewall is 40% of the width, so 102 mm here. ZR marks the construction (radial). 19 is the wheel diameter in inches.

Size Dimensions & Specs

Tires Size 255/40ZR19

Dimensions, specs, and every size 255/40ZR19 tire currently in stock

Overall Height

27.04"

687 mm · calculated

Section Width

255 mm

10.04 inches

Sidewall Height

4.02"

102 mm · 40% profile

Wheel Diameter

19"

482.6 mm

255/40ZR19 Specifications

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

Specification	Imperial	Metric
Section width	10.04 in	255 mm
Aspect ratio	40%	—
Sidewall height	4.02 in	102 mm
Overall diameter (calculated)	27.04 in	687 mm
Wheel / rim diameter	19 in	482.6 mm
Construction	Radial	—

What does 255/40ZR19 mean?

Reading the code on your sidewall

Section width

255 mm

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

Aspect ratio

40% profile

The sidewall stands 40% of the section width, which is 102 mm on this size.

Construction (ZR)

Radial

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

Wheel diameter

19 in

Fits a wheel measuring 19 inches across.

255/40ZR19 Questions & Answers

Dimensions and fitment guidelines for size 255/40ZR19

Tires Size 255/40ZR19

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255/40ZR19 Specifications

What does 255/40ZR19 mean?

255 mm

40% profile

Radial

19 in

255/40ZR19 Questions & Answers

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