225/45R18 Tire Size Specifications & Compatible Vehicles
Overall Diameter
659.7 mm
Section Width
225 mm
Sidewall Height
101.3 mm
Circumference
2072.5 mm
Revs/Mile
777
Rim Diameter
18"
Inch Equivalent
26x8.9R18
Rim Width (ETRTO)
6.5" – 8.5"
Compatible Vehicles
The following vehicles use 225/45R18 tires from the factory:
2025 BMW 3 Series 330i 2025 BMW 3 Series 330i xDrive 2024 BMW 3 Series 330i 2024 BMW 3 Series 330i xDrive 2023 BMW 3 Series 330i 2023 BMW 3 Series 330i xDrive 2022 BMW 3 Series 330i 2022 BMW 3 Series 330i xDrive 2021 BMW 3 Series 330i 2021 BMW 3 Series 330i xDrive 2020 BMW 3 Series 330i 2020 BMW 3 Series 330i xDrive 2025 Genesis G70 2.0T 2024 Genesis G70 2.0T 2023 Genesis G70 2.0T 2022 Genesis G70 2.0T 2021 Genesis G70 2.0T 2020 Genesis G70 2.0T 2025 Mercedes-Benz C-Class C 300 2025 Mercedes-Benz C-Class C 300 4MATIC 2024 Mercedes-Benz C-Class C 300 2024 Mercedes-Benz C-Class C 300 4MATIC 2023 Mercedes-Benz C-Class C 300 2023 Mercedes-Benz C-Class C 300 4MATIC 2022 Mercedes-Benz C-Class C 300 2022 Mercedes-Benz C-Class C 300 4MATIC 2021 Mercedes-Benz C-Class C 300 2021 Mercedes-Benz C-Class C 300 4MATIC 2020 Mercedes-Benz C-Class C 300 2020 Mercedes-Benz C-Class C 300 4MATIC 2025 Volkswagen Jetta GLI 2024 Volkswagen Jetta GLI 2023 Volkswagen Jetta GLI 2022 Volkswagen Jetta GLI 2021 Volkswagen Jetta GLI 2020 Volkswagen Jetta GLI
Alternative Tire Sizes
These tire sizes are within 3% overall diameter of 225/45R18 and may be used as replacements:
Popular Comparisons
See how 225/45R18 compares to other common tire sizes:
Understanding 225/45R18
The tire size 225/45R18 means the tire has a section width of 225mm, an aspect ratio of 45% (the sidewall height is 45% of the width), and fits a 18-inch rim.
Sidewall Height = 225 x 0.45 = 101.3 mm
Overall Diameter = (101.3 x 2) + (18 x 25.4) = 659.7 mm
Circumference = 659.7 x π = 2072.5 mm
Overall Diameter = (101.3 x 2) + (18 x 25.4) = 659.7 mm
Circumference = 659.7 x π = 2072.5 mm
Frequently Asked Questions
The 225/45R18 tire size is used on 36 vehicle trims including the 2025 BMW 3 Series, 2025 BMW 3 Series, 2024 BMW 3 Series and 33 more.
A 225/45R18 tire has an overall diameter of 659.7mm (26.0 inches). The sidewall height is 101.3mm, and the total circumference is 2073mm.
For 225/45R18 tires, the ETRTO recommended rim width is 7.5". The acceptable range is 6.5" minimum to 8.5" maximum. Using a rim outside this range can cause improper bead seating and unsafe handling.
Yes, as long as the replacement tire overall diameter is within 3% of the 225/45R18 659.7mm diameter. Compatible alternatives include 285/40R17, 295/30R19, 195/65R16. Use our Tire Size Calculator to compare any two sizes.