235/85R16 tire size
A 235/85R16 tire is 31.7 inches (806 mm) tall and 9.3 inches (235 mm) wide, for a 16-inch wheel. Each sidewall is 7.9 inches (200 mm), 85% of the width, and the tire makes about 636 revolutions a mile.
Sources checked
| Dimension | 235/85R16 |
|---|---|
| Overall diameter | 31.73 in (806 mm) |
| Section width | 9.25 in (235 mm) |
| Sidewall height | 7.86 in (200 mm) |
| Aspect ratio | 85% |
| Rim diameter | 16 in |
| Circumference | 99.7 in (2,532 mm) |
| Revolutions per mile | 636 |
| Revolutions per km | 395 |
Compare 235/85R16 with another size
Metric, LT and flotation
A 235/85R16 tire is
31.7in tall806mm
on a 16-inch wheel
- Width
- 9.25 in (235 mm)
- Sidewall
- 7.86 in (200 mm)
- Circumference
- 99.7 in
- Revolutions per mile
- 636
235/85R16 in full
| Dimension | 235/85R16 |
|---|---|
| Overall diameter | 31.73 in (806 mm) |
| Section width | 9.25 in (235 mm) |
| Sidewall height | 7.86 in (200 mm) |
| Aspect ratio | 85% |
| Rim diameter | 16 in |
| Circumference | 99.7 in |
| Revolutions per mile | 636 |
| Revolutions per km | 395 |
The working
- 235/85R16: sidewall = 235 mm × 85% = 199.8 mm = 7.86 in.
- Diameter = rim + 2 × sidewall = 16 + 2 × 7.86 = 31.73 in (806 mm).
- Circumference = π × 31.73 = 99.7 in; revolutions per mile = 63,360 ÷ 99.7 = 636.
Where the 235/85R16 numbers come from
The section width is 235 mm (9.25 inches), and each sidewall is 85% of it: 199.8 mm, or 7.86 inches. Two sidewalls and the 16-inch rim make 31.73 inches (806 mm).
One turn covers π × 31.73 = 99.7 inches, so the tire turns 636 times a mile and 395 times a kilometer.
What tire makers publish for 235/85R16
Inflated on the maker’s measuring rim. The percentage is the printed diameter against the 31.73 inches worked out above.
| Tire | Size as printed | Diameter | Width | Revs per mile |
|---|---|---|---|---|
| Toyo Open Country A/T III | LT235/85R16 | 31.7 in (−0.1%) | 9.3 in | 655 |
Other 16-inch sizes against 235/85R16
Each size’s height against 235/85R16, and what a speedometer set for 235/85R16 shows at 60 mph with that size on.
| Size | Diameter | Width | Height change | At 60 mph shown |
|---|---|---|---|---|
| 205/55R16 | 24.9 in | 8.1 in | −21.6% | 47.0 mph |
| 205/60R16 | 25.7 in | 8.1 in | −19.0% | 48.6 mph |
| 215/60R16 | 26.2 in | 8.5 in | −17.6% | 49.5 mph |
| 215/65R16 | 27.0 in | 8.5 in | −14.9% | 51.1 mph |
| 225/60R16 | 26.6 in | 8.9 in | −16.1% | 50.4 mph |
| 225/65R16 | 27.5 in | 8.9 in | −13.3% | 52.0 mph |
| 225/75R16 | 29.3 in | 8.9 in | −7.7% | 55.4 mph |
| 235/70R16 | 29.0 in | 9.3 in | −8.7% | 54.8 mph |
| 245/70R16 | 29.5 in | 9.6 in | −7.0% | 55.8 mph |
| 245/75R16 | 30.5 in | 9.6 in | −4.0% | 57.6 mph |
| 265/70R16 | 30.6 in | 10.4 in | −3.5% | 57.9 mph |
| 265/75R16 | 31.6 in | 10.4 in | −0.2% | 59.9 mph |
| 285/75R16 | 32.8 in | 11.2 in | +3.5% | 62.1 mph |
| 315/75R16 | 34.6 in | 12.4 in | +9.1% | 65.4 mph |
Every size: the tire size calculator. With the wheels off, the nuts go back on at your vehicle’s lug nut torque.
Questions
What is 235/85R16 in inches?
About 31.7x9.3R16: 31.7 inches tall and 9.3 inches wide on a 16-inch wheel, with 7.9-inch sidewalls. Exactly, 16 + 2 × 235 mm × 0.85 ÷ 25.4 = 31.73 inches.
How many revolutions per mile does a 235/85R16 make?
636 by its diameter: 63,360 inches in a mile ÷ 99.7 inches a turn. Tire makers’ published figures are measured under load, when the tire rolls on a slightly smaller radius, and run 2.8% to 3.3% higher in Toyo’s tables.
Is LT235/85R16 the same size as P235/85R16?
In dimensions, yes: the numbers mean the same in every metric size. The letters mark what the tire is built for, and an LT tire’s load is rated differently, so check the load index and pressure your vehicle needs before swapping one for the other.
Sources
- Bridgestone Americas: Determining tire size: P-metric, Euro-metric, LT-metric, C-type and flotation sizes, and what each number means (checked October 28, 2026)
- Toyo Tires: Extensa A/S II sizes and specifications: inflated overall diameter and width, revolutions per mile (checked October 28, 2026)
- Toyo Tires: Proxes Sport A/S sizes and specifications: inflated overall diameter and width, revolutions per mile (checked October 28, 2026)
- Toyo Tires: Open Country A/T III sizes and specifications: P-metric, LT-metric and flotation sizes, with revolutions per mile (checked October 28, 2026)
- Nitto Tire: Trail Grappler M/T sizes and specs: inflated overall diameter and width, LT-metric and flotation sizes (checked October 28, 2026)
Spotted a number that doesn’t match your manual or a source? Tell us; corrections are logged on the sources page.