275/65R18 Tire Size Specifications & Compatible Vehicles
Overall Diameter
814.7 mm
Section Width
275 mm
Sidewall Height
178.8 mm
Circumference
2559.5 mm
Revs/Mile
629
Rim Diameter
18"
Inch Equivalent
32.1x10.8R18
Rim Width (ETRTO)
8.5" – 11.0"
Compatible Vehicles
The following vehicles use 275/65R18 tires from the factory:
2025 Chevrolet Silverado Trail Boss/ZR2 2024 Chevrolet Silverado Trail Boss/ZR2 2025 Ford F-150 XLT 2024 Ford F-150 XLT 2023 Ford F-150 XLT 2022 Ford F-150 XLT 2021 Ford F-150 XLT 2020 Ford F-150 XLT 2025 Ram 1500 Big Horn/Lone Star 2024 Ram 1500 Big Horn/Lone Star 2023 Ram 1500 Big Horn/Lone Star 2022 Ram 1500 Big Horn/Lone Star 2021 Ram 1500 Big Horn/Lone Star 2020 Ram 1500 Big Horn/Lone Star 2025 Toyota Tundra SR/SR5 2024 Toyota Tundra SR/SR5 2023 Toyota Tundra SR/SR5 2022 Toyota Tundra SR/SR5 2021 Toyota Tundra SR/SR5 2020 Toyota Tundra SR/SR5
Alternative Tire Sizes
These tire sizes are within 3% overall diameter of 275/65R18 and may be used as replacements:
Popular Comparisons
See how 275/65R18 compares to other common tire sizes:
275/65R18 vs 285/65R18 Truck tire width comparison 275/65R18 vs 275/70R18 Taller sidewall truck upgrade 255/70R18 vs 275/65R18 Wider but shorter profile 265/60R18 vs 275/65R18 Truck wider and taller 265/65R17 vs 275/65R18 Truck rim upgrade wider tire 255/65R18 vs 275/65R18 SUV width upgrade 275/70R17 vs 275/65R18 Truck rim upgrade same width
Understanding 275/65R18
The tire size 275/65R18 means the tire has a section width of 275mm, an aspect ratio of 65% (the sidewall height is 65% of the width), and fits a 18-inch rim.
Sidewall Height = 275 x 0.65 = 178.8 mm
Overall Diameter = (178.8 x 2) + (18 x 25.4) = 814.7 mm
Circumference = 814.7 x π = 2559.5 mm
Overall Diameter = (178.8 x 2) + (18 x 25.4) = 814.7 mm
Circumference = 814.7 x π = 2559.5 mm
Frequently Asked Questions
The 275/65R18 tire size is used on 20 vehicle trims including the 2025 Chevrolet Silverado, 2024 Chevrolet Silverado, 2025 Ford F-150 and 17 more.
A 275/65R18 tire has an overall diameter of 814.7mm (32.1 inches). The sidewall height is 178.8mm, and the total circumference is 2560mm.
For 275/65R18 tires, the ETRTO recommended rim width is 9.5". The acceptable range is 8.5" minimum to 11.0" 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 275/65R18 814.7mm diameter. Compatible alternatives include 325/55R18, 255/80R16, 225/85R17. Use our Tire Size Calculator to compare any two sizes.