How tall is a 285/40R17 tire?

A 285/40R17 has a nominal overall diameter of 25.98 inches (660 mm), calculated as the 17-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 285/40R17 tire fit?

A 285/40R17 fits a wheel of 17 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 285/40R17 mean?

285 is the section width in millimetres. 40 is the aspect ratio — the sidewall is 40% of the width, so 114 mm here. R marks the construction (radial). 17 is the wheel diameter in inches.

Size Dimensions & Specs

Tires Size 285/40R17

Dimensions, specs, and every size 285/40R17 tire currently in stock

Overall Height

25.98"

660 mm · calculated

Section Width

285 mm

11.22 inches

Sidewall Height

4.49"

114 mm · 40% profile

Wheel Diameter

17"

431.8 mm

285/40R17 Specifications

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

Specification	Imperial	Metric
Section width	11.22 in	285 mm
Aspect ratio	40%	—
Sidewall height	4.49 in	114 mm
Overall diameter (calculated)	25.98 in	660 mm
Wheel / rim diameter	17 in	431.8 mm
Construction	Radial	—

What does 285/40R17 mean?

Reading the code on your sidewall

Section width

285 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 114 mm on this size.

Construction (R)

Radial

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

Wheel diameter

17 in

Fits a wheel measuring 17 inches across.

285/40R17 Questions & Answers

Dimensions and fitment guidelines for size 285/40R17

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