285/35R21 Tire Size Specifications & Compatible Vehicles
Overall Diameter
732.9 mm
Section Width
285 mm
Sidewall Height
99.8 mm
Circumference
2302.5 mm
Revs/Mile
699
Rim Diameter
21"
Inch Equivalent
28.9x11.2R21
Rim Width (ETRTO)
8.5" – 11.0"
Alternative Tire Sizes
These tire sizes are within 3% overall diameter of 285/35R21 and may be used as replacements:
Popular Comparisons
See how 285/35R21 compares to other common tire sizes:
Understanding 285/35R21
The tire size 285/35R21 means the tire has a section width of 285mm, an aspect ratio of 35% (the sidewall height is 35% of the width), and fits a 21-inch rim.
Sidewall Height = 285 x 0.35 = 99.8 mm
Overall Diameter = (99.8 x 2) + (21 x 25.4) = 732.9 mm
Circumference = 732.9 x π = 2302.5 mm
Overall Diameter = (99.8 x 2) + (21 x 25.4) = 732.9 mm
Circumference = 732.9 x π = 2302.5 mm
Frequently Asked Questions
The 285/35R21 is a standard tire size. Check your vehicle door jamb sticker or owner manual to confirm compatibility.
A 285/35R21 tire has an overall diameter of 732.9mm (28.9 inches). The sidewall height is 99.8mm, and the total circumference is 2303mm.
For 285/35R21 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 285/35R21 732.9mm diameter. Compatible alternatives include 225/50R20, 205/55R20, 175/50R22. Use our Tire Size Calculator to compare any two sizes.