How tall is a 265/40R21 tire?

A 265/40R21 has a nominal overall diameter of 29.34 inches (745 mm), calculated as the 21-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 265/40R21 tire fit?

A 265/40R21 fits a wheel of 21 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 265/40R21 mean?

265 is the section width in millimetres. 40 is the aspect ratio — the sidewall is 40% of the width, so 106 mm here. R marks the construction (radial). 21 is the wheel diameter in inches.

Size Dimensions & Specs

Tires Size 265/40R21

Dimensions, specs, and every size 265/40R21 tire currently in stock

Overall Height

29.34"

745 mm · calculated

Section Width

265 mm

10.43 inches

Sidewall Height

4.17"

106 mm · 40% profile

Wheel Diameter

21"

533.4 mm

265/40R21 Specifications

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

Specification	Imperial	Metric
Section width	10.43 in	265 mm
Aspect ratio	40%	—
Sidewall height	4.17 in	106 mm
Overall diameter (calculated)	29.34 in	745 mm
Wheel / rim diameter	21 in	533.4 mm
Construction	Radial	—

What does 265/40R21 mean?

Reading the code on your sidewall

Section width

265 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 106 mm on this size.

Construction (R)

Radial

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

Wheel diameter

21 in

Fits a wheel measuring 21 inches across.

265/40R21 Questions & Answers

Dimensions and fitment guidelines for size 265/40R21

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