How tall is a 245/45R20 tire?

A 245/45R20 has a nominal overall diameter of 28.68 inches (728 mm), calculated as the 20-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 245/45R20 tire fit?

A 245/45R20 fits a wheel of 20 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 245/45R20 mean?

245 is the section width in millimetres. 45 is the aspect ratio — the sidewall is 45% of the width, so 110.3 mm here. R marks the construction (radial). 20 is the wheel diameter in inches.

Size Dimensions & Specs

Tires Size 245/45R20

Dimensions, specs, and every size 245/45R20 tire currently in stock

Overall Height

28.68"

728 mm · calculated

Section Width

245 mm

9.65 inches

Sidewall Height

4.34"

110.3 mm · 45% profile

Wheel Diameter

20"

508.0 mm

245/45R20 Specifications

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

Specification	Imperial	Metric
Section width	9.65 in	245 mm
Aspect ratio	45%	—
Sidewall height	4.34 in	110.3 mm
Overall diameter (calculated)	28.68 in	728 mm
Wheel / rim diameter	20 in	508.0 mm
Construction	Radial	—

What does 245/45R20 mean?

Reading the code on your sidewall

Section width

245 mm

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

Aspect ratio

45% profile

The sidewall stands 45% of the section width, which is 110.3 mm on this size.

Construction (R)

Radial

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

Wheel diameter

20 in

Fits a wheel measuring 20 inches across.

245/45R20 Questions & Answers

Dimensions and fitment guidelines for size 245/45R20

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

245/45ZR19 ATLANDER XSPORT-86 102W XL 420A-A 50K + ROAD HAZARD

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

P215/60R17 LEXANI QUATTRO TEMPO TOUR AW 96H BLK 600A-A 70K+ ROAD HAZARD

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

275/35ZR20 COSMO MUCHOMACHO 102Y XL 300-A-A 30K + ROAD HAZARD

LT245/75R16 ARMSTRONG TRU-TRAC A/T 120/116S 10PLY 65K+ROAD HAZARD

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

LT265/65R18 RBP REPULSOR A/T PLATEAU 122/119R 10PLY M+S 50K + ROAD HAZARD

P215/55R17 LIONHART RAMANI A/S 98W XL BLK 500A-A 50K + ROAD HAZARD

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

145/70R13 ARMSTRONG BLU-TRAC PC 71T 700-A-A 85K+ ROAD HAZARD

275/30ZR21 ROYALBLACK RACINGTRAC 102Y XL 420-A-A 50K + ROAD HAZARD

LT275/65R20 ROYALBLACK TERRA FORCE RTX R/T 128/125S 12PLY

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

11R24.5 TRAVELSTAR TD660 CS DRIVE 149/146M 16PLY

215/40ZR18 ROADTRACK TERRENA UHP 89W XL 420-A-A 50K + ROAD HAZARD

205/40ZR17 ROYALBLACK RACINGTRAC 84W XL 420-A-A 50K + ROAD HAZARD

245/45ZR19 ZEETEX HP1000 102Y XL 400-A-A REINFORCED