tireheight.com

285/50R20 in inches

A 285/50R20 tire is 31.2″ tall and 11.2″ wide, and fits a 20″ wheel. In inches it is written 31.2×11.2R20.

Diameter31.22″
Width11.22″
Sidewall5.61″
285/50R20 drawn to scale: 31.22 inch diameter, 5.61 inch sidewall, 20 inch wheel, 11.22 inch tread width20″ wheel5.61″31.22″ overall11.22″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 285/50R20 tires really are

Heights published by Michelin and Toyo for all 6 tires in this size. Their published revolutions per mile work out to 30.3″ under load (below).

Real 285/50R20 tires measure 31.26–31.30″, against 31.22″ from the size code. Every one runs taller than the size code.

Height under load30.3″

Published revs per mile (665) mean the tire rolls like a 30.3″ tire on the vehicle. Use this for speedometer calibration.

Weight spread36.6–44.5 lb

The lightest (Michelin Pilot Sport 4 SUV, XL) is 7.9 lb lighter per corner than the heaviest (Toyo Open Country H/T II, SL).

6 tires in 285/50R20

Sort by the spec you care about.

LoadRevs/miSource
Michelin Pilot Sport 4 SUVPerformanceXL · 116W31.3036.69.52,756665Spec page
Michelin X-Ice Snow+WinterXL · 116H31.2637.010.52,756665Spec page
Michelin X-Ice SnowWinterXL · 116T31.2637.610.52,756665Spec page
Michelin Defender LTX M/S 2All-seasonXL · 116H31.3039.011.02,756665Spec page
Toyo Proxes ST IIIPerformanceXL · 116V31.2640.610.12,756665Spec page
Toyo Open Country H/T IIHighwaySL · 112V31.2644.511.22,469665Spec page

Is 285/50R20 a 31-inch tire?

≈31″

Yes. The size code works out to 31.22″, and the 6 tires here publish 31.26–31.30″, so people call it a 31.

All 31-inch tire sizes, on every wheel size.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 285/50R20Difference
265/50R2030.43-0.79″-2.5%
295/45R2030.45-0.77″-2.5%
305/45R2030.81-0.41″-1.3%
275/50R2030.83-0.39″-1.3%
255/55R2031.04-0.18″-0.6%
235/60R2031.10-0.12″-0.4%
265/55R2031.48+0.26″+0.8%
245/60R2031.57+0.35″+1.1%
275/55R2031.91+0.69″+2.2%
305/50R2032.01+0.79″+2.5%

How to read 285/50R20

How to read any tire size

285/50R20 116H as printed on the tire sidewall, with each part numbered285/50R20 116H123456
How 285/50R20 116H is printed on the sidewall. It's the most common code among the 6 tires here (2 of them); tires in this size come in other load and speed ratings too.
1285Section width

285 mm across the widest point, or 11.22 inches. Every 285 size

250Aspect ratio

A percentage, not a measurement: the sidewall is 50% as tall as the tire is wide, which is 142.5 mm or 5.61 inches.

3RConstruction

Radial construction.

420Wheel diameter

Mounts on a 20-inch wheel. Approved wheel widths run 8.0″ to 10.0″.

5116Load index

Each tire carries up to 2,756 lb (1,250 kg) at its maximum pressure.

6HSpeed rating

Rated for up to 130 mph sustained.

XLExtra load

Printed after the size. In this size the XL tires carry up to 2,756 lb each and the standard-load tires up to 2,469 lb, as published.

SpecificationInchesMetric
Overall diameter31.22793 mm
Section width11.22285 mm
Sidewall height5.61142.5 mm
Circumference98.12,491 mm
Revolutions per mile (calculated, unloaded)646.0401 per km
Revolutions per mile (published by manufacturers)665413 per km
Approved wheel width8.0–10.0203–254 mm

Speedometer error after switching to 285/50R20

Your actual speed– mph

Questions about 285/50R20

What is 285/50R20 in inches?

31.22 inches tall, 11.22 inches wide, on a 20-inch wheel. Written in inches, that is roughly 31.2×11.2R20.

How much does a 285/50R20 tire weigh?

Between 36.6 lb and 44.5 lb for the 6 tires listed here. The lightest is the Michelin Pilot Sport 4 SUV (XL); the heaviest is the Toyo Open Country H/T II (SL).

What wheel width do I need for 285/50R20?

Manufacturers approve 8.0–10.0″ wide wheels for this size.

How many revolutions per mile does a 285/50R20 make?

Published figures run 665 revolutions per mile. The calculated figure is 646.0, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 285/50R20 than 235/60R20?

0.12 inches taller on paper (31.22″ vs 31.10″), which raises the axle about 0.06″. Your speedometer will read about 0.4% slow.