How tall is a ST225/75D15 tire?

A ST225/75D15 has a nominal overall diameter of 28.3 inches (719 mm), calculated as the 15-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 ST225/75D15 tire fit?

A ST225/75D15 fits a wheel of 15 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 ST225/75D15 mean?

225 is the section width in millimetres. 75 is the aspect ratio — the sidewall is 75% of the width, so 168.8 mm here. D marks the construction (bias-ply (diagonal)). 15 is the wheel diameter in inches.

Is ST225/75D15 a radial tire?

No. The "D" in ST225/75D15 marks bias-ply (diagonal) construction, not radial. Radial and bias-ply tires should not be mixed on the same axle.

Size Dimensions & Specs

Tires Size ST225/75D15

Dimensions, specs, and every size ST225/75D15 tire currently in stock

Overall Height

28.3"

719 mm · calculated

Section Width

225 mm

8.86 inches

Sidewall Height

6.65"

168.8 mm · 75% profile

Wheel Diameter

15"

381.0 mm

ST225/75D15 Specifications

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

Specification	Imperial	Metric
Section width	8.86 in	225 mm
Aspect ratio	75%	—
Sidewall height	6.65 in	168.8 mm
Overall diameter (calculated)	28.3 in	719 mm
Wheel / rim diameter	15 in	381.0 mm
Construction	Bias-ply (diagonal)	—
Service type	Special trailer	—

What does ST225/75D15 mean?

Reading the code on your sidewall

Section width

225 mm

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

Aspect ratio

75% profile

The sidewall stands 75% of the section width, which is 168.8 mm on this size.

Construction (D)

Bias-ply (diagonal)

The body plies run diagonally rather than radially. Do not mix construction types on one axle.

Wheel diameter

15 in

Fits a wheel measuring 15 inches across.

ST225/75D15 Questions & Answers

Dimensions and fitment guidelines for size ST225/75D15

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