255/45R20 Tire Size Specifications & Compatible Vehicles

Overall Diameter

737.5 mm

Section Width

255 mm

Sidewall Height

114.8 mm

Circumference

2316.9 mm

Revs/Mile

695

Rim Diameter

20"

Inch Equivalent

29x10R20

Rim Width (ETRTO)

7.5" – 10.0"

Compatible Vehicles

The following vehicles use 255/45R20 tires from the factory:

2025 Acura RDX A-Spec 2024 Acura RDX A-Spec 2023 Acura RDX A-Spec 2022 Acura RDX A-Spec 2021 Acura RDX A-Spec 2020 Acura RDX A-Spec 2025 Audi Q5 Prestige 45 TFSI quattro 2024 Audi Q5 Prestige 45 TFSI quattro 2021 Audi Q5 Prestige 45 TFSI quattro 2020 Audi Q5 Prestige 45 TFSI quattro 2025 Genesis GV70 2.5T Advanced 2024 Genesis GV70 2.5T Advanced 2024 Hyundai Santa Fe Calligraphy 2023 Hyundai Santa Fe Calligraphy 2025 Mitsubishi Outlander SEL 2024 Mitsubishi Outlander SEL 2023 Mitsubishi Outlander SEL 2022 Mitsubishi Outlander SEL

Alternative Tire Sizes

These tire sizes are within 3% overall diameter of 255/45R20 and may be used as replacements:

255/50R19 Safe 0.0% diff 255/40R21 Safe 0.0% diff 165/85R18 Safe 0.0% diff 255/55R18 Safe 0.0% diff 255/35R22 Safe 0.0% diff 175/80R18 Safe 0.0% diff 185/55R21 Safe 0.1% diff 215/65R18 Safe 0.1% diff 205/50R21 Safe 0.1% diff 225/40R22 Safe 0.2% diff 195/65R19 Safe 0.2% diff 165/70R20 Safe 0.2% diff

Popular Comparisons

See how 255/45R20 compares to other common tire sizes:

255/45R20 vs 265/45R20 Performance SUV width upgrade 255/45R20 vs 275/40R21 Performance SUV plus-one

Understanding 255/45R20

The tire size 255/45R20 means the tire has a section width of 255mm, an aspect ratio of 45% (the sidewall height is 45% of the width), and fits a 20-inch rim.

Sidewall Height = 255 x 0.45 = 114.8 mm
Overall Diameter = (114.8 x 2) + (20 x 25.4) = 737.5 mm
Circumference = 737.5 x π = 2316.9 mm

Frequently Asked Questions

What vehicles use 255/45R20 tires? ▼

The 255/45R20 tire size is used on 18 vehicle trims including the 2025 Acura RDX, 2024 Acura RDX, 2023 Acura RDX and 15 more.

What is the diameter of a 255/45R20 tire? ▼

A 255/45R20 tire has an overall diameter of 737.5mm (29.0 inches). The sidewall height is 114.8mm, and the total circumference is 2317mm.

What rim width do I need for 255/45R20 tires? ▼

For 255/45R20 tires, the ETRTO recommended rim width is 8.5". The acceptable range is 7.5" minimum to 10.0" maximum. Using a rim outside this range can cause improper bead seating and unsafe handling.

Can I replace 255/45R20 with a different size? ▼

Yes, as long as the replacement tire overall diameter is within 3% of the 255/45R20 737.5mm diameter. Compatible alternatives include 255/50R19, 255/40R21, 165/85R18. Use our Tire Size Calculator to compare any two sizes.