How tall is a LT305/65R18 tire?

A LT305/65R18 has a nominal overall diameter of 33.62 inches (854 mm), calculated as the 18-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 LT305/65R18 tire fit?

A LT305/65R18 fits a wheel of 18 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 LT305/65R18 mean?

305 is the section width in millimetres. 65 is the aspect ratio — the sidewall is 65% of the width, so 198.3 mm here. R marks the construction (radial). 18 is the wheel diameter in inches.

Size Dimensions & Specs

Tires Size LT305/65R18

Dimensions, specs, and every size LT305/65R18 tire currently in stock

Overall Height

33.62"

854 mm · calculated

Section Width

305 mm

12.01 inches

Sidewall Height

7.81"

198.3 mm · 65% profile

Wheel Diameter

18"

457.2 mm

LT305/65R18 Specifications

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

Specification	Imperial	Metric
Section width	12.01 in	305 mm
Aspect ratio	65%	—
Sidewall height	7.81 in	198.3 mm
Overall diameter (calculated)	33.62 in	854 mm
Wheel / rim diameter	18 in	457.2 mm
Construction	Radial	—
Service type	Light truck	—

What does LT305/65R18 mean?

Reading the code on your sidewall

Section width

305 mm

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

Aspect ratio

65% profile

The sidewall stands 65% of the section width, which is 198.3 mm on this size.

Construction (R)

Radial

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

Wheel diameter

18 in

Fits a wheel measuring 18 inches across.

LT305/65R18 Questions & Answers

Dimensions and fitment guidelines for size LT305/65R18

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