How tall is a 235/55R18 tire?

A 235/55R18 has a nominal overall diameter of 28.18 inches (716 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 235/55R18 tire fit?

A 235/55R18 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 235/55R18 mean?

235 is the section width in millimetres. 55 is the aspect ratio — the sidewall is 55% of the width, so 129.3 mm here. R marks the construction (radial). 18 is the wheel diameter in inches.

Size Dimensions & Specs

Tires Size 235/55R18

Dimensions, specs, and every size 235/55R18 tire currently in stock

Overall Height

28.18"

716 mm · calculated

Section Width

235 mm

9.25 inches

Sidewall Height

5.09"

129.3 mm · 55% profile

Wheel Diameter

18"

457.2 mm

235/55R18 Specifications

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

Specification	Imperial	Metric
Section width	9.25 in	235 mm
Aspect ratio	55%	—
Sidewall height	5.09 in	129.3 mm
Overall diameter (calculated)	28.18 in	716 mm
Wheel / rim diameter	18 in	457.2 mm
Construction	Radial	—

What does 235/55R18 mean?

Reading the code on your sidewall

Section width

235 mm

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

Aspect ratio

55% profile

The sidewall stands 55% of the section width, which is 129.3 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.

235/55R18 Questions & Answers

Dimensions and fitment guidelines for size 235/55R18

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.

100% Guaranteed Fitment Advice

Talk to a Tire Specialist Today

We make tire buying fast and effortless. Call or email us anytime to verify size compatibility, load index, or speed ratings for your vehicle.

Call Direct

(916) 520-1702

Send Email

info@natireshub.com

Mon - Fri: 8:00 AM - 5:00 PM PST

✓

Fast Expert Advice

Response within 1 business hour

Live Inventory

Shop Our Collection

Explore premium tires, wheels, and fitments from top brands

265/70R16 ZEETEX HT1000 112H 600-A-A 50K + ROAD HAZARD

$245/45R19 VOGUE CUSTOM BUILT RADIAL VIII 102V XL 0.87\ GOLD/WHITE 460-A-A 60K"$

245/45R19 VOGUE CUSTOM BUILT RADIAL VIII 102V XL 0.87\ GOLD/WHITE 460-A-A 60K"

LT285/70R17 LANVIGATOR VALIANT A/T 126/123R 10PLY 50K + ROAD HAZAR

225/55ZR18 LEXANI LXUHP-207 102W XL 500-A-A 50K + ROAD HAZARD

235/50ZR18 ROADTRACK TERRENA UHP 110W XL 420-A-A 50K + ROAD HAZARD

295/35ZR24 ROYALBLACK RACINGTRAC 110W 420-A-A 50K + ROAD HAZARD

275/45ZR20 ROYALBLACK RACINGTRAC 110W 420-A-A 50K + ROAD HAZARD

235/55R19 ARMSTRONG TRU-TRAC SU 105V XL M+S 440-A-A 65K+ ROAD HAZARD

265/70R17 TRAVELSTAR ECOPATH A/T 115T 520-A-B 50K + ROAD HAZARD

LT235/85R16 ATLANDER ROVERCLAW M/T I 120/116Q 10PLY

LT265/70R16 LIONHART LIONCLAW ATX2 BLK 10PLY 40K+ ROAD HAZARD

P255/55R18 LEXANI QUATTRO TEMPO TOUR AW 109V BLK 600A-A 70K+ ROAD HAZARD

LT295/65R20 GLADIATOR X COMP M/T 129/126 10PLY

225/55R17 ZENNA SPORT LINE 101V XL M+S 420-A-A 60K + ROAD HAZARD

235/65R16C WATERFALL LT-300 121/119Q 12PLY

235/50R19 COSMO ROAD HUNTER 99V M+S 560A-A 60K + ROAD HAZARD

245/30ZR22 PEGASUS HPX SPORT A/S 92W XL 420 AA A 50K + ROAD HAZARD

265/70R16 COSMO EL JEFE H/T BW 112H M+S 560-A-A 55K+ROAD HAZARD