235/50R18 Tire Size Specifications & Compatible Vehicles
Overall Diameter
692.2 mm
Section Width
235 mm
Sidewall Height
117.5 mm
Circumference
2174.6 mm
Revs/Mile
740
Rim Diameter
18"
Inch Equivalent
27.3x9.3R18
Rim Width (ETRTO)
7.0" – 9.0"
Compatible Vehicles
The following vehicles use 235/50R18 tires from the factory:
Alternative Tire Sizes
These tire sizes are within 3% overall diameter of 235/50R18 and may be used as replacements:
Popular Comparisons
See how 235/50R18 compares to other common tire sizes:
Understanding 235/50R18
The tire size 235/50R18 means the tire has a section width of 235mm, an aspect ratio of 50% (the sidewall height is 50% of the width), and fits a 18-inch rim.
Sidewall Height = 235 x 0.5 = 117.5 mm
Overall Diameter = (117.5 x 2) + (18 x 25.4) = 692.2 mm
Circumference = 692.2 x π = 2174.6 mm
Overall Diameter = (117.5 x 2) + (18 x 25.4) = 692.2 mm
Circumference = 692.2 x π = 2174.6 mm
Frequently Asked Questions
The 235/50R18 tire size is used on 5 vehicle trims including the 2025 Acura TLX, 2024 Acura TLX, 2023 Acura TLX and 2 more.
A 235/50R18 tire has an overall diameter of 692.2mm (27.3 inches). The sidewall height is 117.5mm, and the total circumference is 2175mm.
For 235/50R18 tires, the ETRTO recommended rim width is 8.0". The acceptable range is 7.0" minimum to 9.0" 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 235/50R18 692.2mm diameter. Compatible alternatives include 205/45R20, 325/40R17, 175/60R19. Use our Tire Size Calculator to compare any two sizes.