275/50R18 Tire Size Specifications & Compatible Vehicles
Overall Diameter
732.2 mm
Section Width
275 mm
Sidewall Height
137.5 mm
Circumference
2300.3 mm
Revs/Mile
700
Rim Diameter
18"
Inch Equivalent
28.8x10.8R18
Rim Width (ETRTO)
8.5" – 11.0"
Alternative Tire Sizes
These tire sizes are within 3% overall diameter of 275/50R18 and may be used as replacements:
Understanding 275/50R18
The tire size 275/50R18 means the tire has a section width of 275mm, an aspect ratio of 50% (the sidewall height is 50% of the width), and fits a 18-inch rim.
Sidewall Height = 275 x 0.5 = 137.5 mm
Overall Diameter = (137.5 x 2) + (18 x 25.4) = 732.2 mm
Circumference = 732.2 x π = 2300.3 mm
Overall Diameter = (137.5 x 2) + (18 x 25.4) = 732.2 mm
Circumference = 732.2 x π = 2300.3 mm
Frequently Asked Questions
The 275/50R18 is a standard tire size. Check your vehicle door jamb sticker or owner manual to confirm compatibility.
A 275/50R18 tire has an overall diameter of 732.2mm (28.8 inches). The sidewall height is 137.5mm, and the total circumference is 2300mm.
For 275/50R18 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 275/50R18 732.2mm diameter. Compatible alternatives include 305/45R18, 215/70R17, 325/50R16. Use our Tire Size Calculator to compare any two sizes.