What wheel size does a ST145R12 tire fit?

A ST145R12 fits a wheel of 12 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 ST145R12 mean?

145 is the section width in millimetres, R marks the construction (radial), and 12 is the wheel diameter in inches. This size states no aspect ratio, so its overall height is not derivable from the code — check the manufacturer's spec sheet for the fitted height.

Size Dimensions & Specs

Tires Size ST145R12

Dimensions, specs, and every size ST145R12 tire currently in stock

Section Width

145 mm

5.71 inches

Wheel Diameter

12"

304.8 mm

ST145R12 Specifications

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

Specification	Imperial	Metric
Section width	5.71 in	145 mm
Wheel / rim diameter	12 in	304.8 mm
Construction	Radial	—
Service type	Special trailer	—

What does ST145R12 mean?

Reading the code on your sidewall

Section width

145 mm

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

Construction (R)

Radial

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

Wheel diameter

12 in

Fits a wheel measuring 12 inches across.

ST145R12 Questions & Answers

Dimensions and fitment guidelines for size ST145R12

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