285/50R20 Tire Size Specifications & Compatible Vehicles
Overall Diameter
793.0 mm
Section Width
285 mm
Sidewall Height
142.5 mm
Circumference
2491.3 mm
Revs/Mile
646
Rim Diameter
20"
Inch Equivalent
31.2x11.2R20
Rim Width (ETRTO)
8.5" – 11.0"
Alternative Tire Sizes
These tire sizes are within 3% overall diameter of 285/50R20 and may be used as replacements:
Understanding 285/50R20
The tire size 285/50R20 means the tire has a section width of 285mm, an aspect ratio of 50% (the sidewall height is 50% of the width), and fits a 20-inch rim.
Sidewall Height = 285 x 0.5 = 142.5 mm
Overall Diameter = (142.5 x 2) + (20 x 25.4) = 793.0 mm
Circumference = 793.0 x π = 2491.3 mm
Overall Diameter = (142.5 x 2) + (20 x 25.4) = 793.0 mm
Circumference = 793.0 x π = 2491.3 mm
Frequently Asked Questions
The 285/50R20 is a standard tire size. Check your vehicle door jamb sticker or owner manual to confirm compatibility.
A 285/50R20 tire has an overall diameter of 793.0mm (31.2 inches). The sidewall height is 142.5mm, and the total circumference is 2491mm.
For 285/50R20 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 285/50R20 793.0mm diameter. Compatible alternatives include 345/45R19, 195/60R22, 305/55R18. Use our Tire Size Calculator to compare any two sizes.