305/50R20 Tire Size Specifications & Compatible Vehicles
Overall Diameter
813.0 mm
Section Width
305 mm
Sidewall Height
152.5 mm
Circumference
2554.1 mm
Revs/Mile
630
Rim Diameter
20"
Inch Equivalent
32x12R20
Rim Width (ETRTO)
9.5" – 12.0"
Alternative Tire Sizes
These tire sizes are within 3% overall diameter of 305/50R20 and may be used as replacements:
Understanding 305/50R20
The tire size 305/50R20 means the tire has a section width of 305mm, an aspect ratio of 50% (the sidewall height is 50% of the width), and fits a 20-inch rim.
Sidewall Height = 305 x 0.5 = 152.5 mm
Overall Diameter = (152.5 x 2) + (20 x 25.4) = 813.0 mm
Circumference = 813.0 x π = 2554.1 mm
Overall Diameter = (152.5 x 2) + (20 x 25.4) = 813.0 mm
Circumference = 813.0 x π = 2554.1 mm
Frequently Asked Questions
The 305/50R20 is a standard tire size. Check your vehicle door jamb sticker or owner manual to confirm compatibility.
A 305/50R20 tire has an overall diameter of 813.0mm (32.0 inches). The sidewall height is 152.5mm, and the total circumference is 2554mm.
For 305/50R20 tires, the ETRTO recommended rim width is 10.5". The acceptable range is 9.5" minimum to 12.0" 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 305/50R20 813.0mm diameter. Compatible alternatives include 215/65R21, 275/60R19, 175/80R21. Use our Tire Size Calculator to compare any two sizes.