How tall is a 33x12.50R18 tire?

A 33x12.50R18 has a nominal overall diameter of 33 inches (838 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 33x12.50R18 tire fit?

A 33x12.50R18 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 33x12.50R18 mean?

This is a flotation size, quoted in inches rather than millimetres. 33 is the overall diameter, 12.5 is the section width, R marks the construction (radial), and 18 is the wheel diameter.

Free shipping on select tires

Brand-new, never-mounted tires

Ships to your door or installer

Thousands of tires in stock

Free shipping on select tires

Brand-new, never-mounted tires

Ships to your door or installer

Thousands of tires in stock

Size Dimensions & Specs

Tires Size 33x12.50R18

Dimensions, specs, and every size 33x12.50R18 tire currently in stock

Overall Height

33"

838 mm · calculated

Section Width

12.5"

stated in inches

Sidewall Height

7.5"

191 mm

Wheel Diameter

18"

457.2 mm

33x12.50R18 Specifications

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

Specification	Imperial	Metric
Section width	12.5 in	—
Sidewall height	7.5 in	191 mm
Overall diameter (calculated)	33 in	838 mm
Wheel / rim diameter	18 in	457.2 mm
Construction	Radial	—

What does 33x12.50R18 mean?

Reading the code on your sidewall

Overall diameter

33 in

Flotation sizes lead with the tire's full height in inches rather than a width in millimetres.

Section width

12.5 in

The width across the widest point of the tire, also quoted in inches on this style of 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.

33x12.50R18 Questions & Answers

Dimensions and fitment guidelines for size 33x12.50R18

Customer Support & Fitment Advice

Need Help Choosing The Right Tires?

Have questions about fitment, brands, or pricing? Our team of tire experts is here to guide you to the perfect set — zero pressure, zero sales tactics.

Free Fitment Advice

Talk to a Tire Specialist Today

We make tire buying fast and effortless. Call or email us (Mon – Sat, 9AM – 5PM PT) to check size compatibility, load index, or speed ratings for your vehicle.

Call Direct

(916) 520-1702

Send Email

info@natireshub.com

Mon – Sat, 9AM – 5PM PT

✓

Expert Advice

Reply within 1 business day

Live Inventory

Shop Our Collection

Explore premium tires, wheels, and fitments from top brands

Lionhart Lionclaw H/T P265/70R17

Laufenn Fit A/S LH01 Made BY Hankook 255/45ZR20

Toyo Open Country R/T Trail LT285/50R22

Ceat Securedrive SUV A/S 225/60R18

Toyo 225/40R18XL Toy Observe G3-ICE Studded 225/40R18

Atlander Roverstar H/T 265/70R16

Atlander Roverclaw H/T LT235/85R16

Royalblack Milagemax Ltr H/T LT265/75R16

Gripmax Maxgrip R/T 305/45R22

Nokian WR SUV3 Studless Winter 235/55R20