285/45R21 tire size
A 285/45R21 tire stands 31.1 inches tall and 11.2 inches wide, with a 5.0-inch sidewall on a 21-inch rim.
- Overall height
- 31.1 in790 mm
- Section width
- 11.2 in285 mm
- Sidewall height
- 5.0 in128 mm
- Rim diameter
- 21 in533 mm
- Circumference
- 97.7 in2482 mm
- Revolutions per mile
- 649403 per km
- Inch size
- 31.1x11.2R21
Compare it with any other size in the tire size calculator.
Sizes you can swap to
These 21-inch sizes are within two width steps and 3% of a 285/45R21's overall height, the usual limit before the speedometer, ABS and transmission notice. The closest is 265/50R21, 1.1% taller (0.33 in). Wider sizes also need room in the wheel well and a rim width that suits them.
Plus and minus sizes
Changing rim size means changing the sidewall to keep the same overall height. On 19-inch or 20-inch or 22-inch rims, these are the closest matches to a 285/45R21.
Other 21-inch sizes near 285/45R21
285 mm wide, other sidewalls
45 series, other widths
See the other sizes for this rim on 21-inch tire sizes, or other tires about this tall on 31-inch tires.
Shop 285/45R21 tires
These open each store's own list of 285/45R21 tires, where you can filter by type, load and speed rating.
285/45R21 questions
How tall is a 285/45R21 tire?
About 31.1 inches (790 mm) from the ground to the top of the tread, unloaded. On the vehicle, carrying weight, it sits a little lower.
What does 285/45R21 mean?
285 is the section width in millimetres (11.2 in). 45 means the sidewall is 45% of that width: 128 mm, or 5.0 in. R means radial construction, and 21 is the rim diameter in inches.
Can I use 275/45R21 instead of 285/45R21?
275/45R21 is 1.1% shorter (0.35 in) and 10 mm narrower, which is inside the usual 3% rule. With it fitted, the speedometer shows 60 mph when you are doing 59.3 mph.
What is 285/45R21 in inches?
In inch terms it is 31.1x11.2R21: 31.1 inches tall, 11.2 inches wide, for a 21-inch rim.
How many revolutions per mile does a 285/45R21 make?
About 649 turns per mile, worked out from its unloaded circumference of 97.7 inches. Makers list slightly higher numbers for their own tires, because a loaded tire rolls on a smaller radius.