35x12.50R20 tire size
A 35x12.50R20 tire is 35 inches (889 mm) tall and 12.5 inches (318 mm) wide by its name, for a 20-inch wheel, so each sidewall is 7.5 inches (191 mm). It makes about 576 revolutions a mile.
Sources checked
| Dimension | 35x12.50R20 |
|---|---|
| Overall diameter | 35.00 in (889 mm) |
| Section width | 12.50 in (318 mm) |
| Sidewall height | 7.50 in (191 mm) |
| Aspect ratio | 60% |
| Rim diameter | 20 in |
| Circumference | 110.0 in (2,793 mm) |
| Revolutions per mile | 576 |
| Revolutions per km | 358 |
Compare 35x12.50R20 with another size
Metric, LT and flotation
At 60 mph on the speedometer you’re doing
58.4mph
−2.6% · the speedometer reads high
- Height
- −0.93 in (−24 mm)
- Width
- −1.67 in (−42 mm)
- Ground clearance
- −0.46 in (−12 mm)
- Each side, same wheel
- −0.84 in (−21 mm)
35x12.50R20LT and 275/65R20 side by side
| Dimension | 35x12.50R20LT | 275/65R20 | Change |
|---|---|---|---|
| Overall diameter | 35.00 in (889 mm) | 34.07 in (865 mm) | −0.93 in (−24 mm) |
| Section width | 12.50 in (318 mm) | 10.83 in (275 mm) | −1.67 in (−43 mm) |
| Sidewall height | 7.50 in (191 mm) | 7.04 in (179 mm) | −0.46 in (−12 mm) |
| Aspect ratio | 60% | 65% | |
| Rim diameter | 20 in | 20 in | |
| Circumference | 110.0 in | 107.0 in | −3.0 in |
| Revolutions per mile | 576 | 592 | +16 |
| Revolutions per km | 358 | 368 | +10 |
The working
- 35x12.50R20LT: 35.00 in tall and 12.50 in wide, as the size says.
- Sidewall = (diameter − rim) ÷ 2 = (35 − 20) ÷ 2 = 7.50 in.
- Circumference = π × 35.00 = 110.0 in; revolutions per mile = 63,360 ÷ 110.0 = 576.
- 275/65R20: sidewall = 275 mm × 65% = 178.8 mm = 7.04 in.
- Diameter = rim + 2 × sidewall = 20 + 2 × 7.04 = 34.07 in (865 mm).
- Circumference = π × 34.07 = 107.0 in; revolutions per mile = 63,360 ÷ 107.0 = 592.
- Speedometer. True speed = what it shows × new diameter ÷ old = 60 × 34.07 ÷ 35.00 = 58.4 mph.
- Ground clearance. Half the change in diameter: (34.07 − 35.00) ÷ 2 = −0.46 in.
Where the 35x12.50R20 numbers come from
A flotation size names its height and width: 35 inches tall and 12.5 inches wide, on a 20-inch rim. Each sidewall is what’s left: (35 − 20) ÷ 2 = 7.50 inches, so the sidewall is 60% of the width.
One turn covers π × 35.00 = 110.0 inches, so the tire turns 576 times a mile and 358 times a kilometer.
What tire makers publish for 35x12.50R20
Inflated on the maker’s measuring rim. The percentage is the printed diameter against the 35.00 inches worked out above.
| Tire | Size as printed | Diameter | Width | Revs per mile |
|---|---|---|---|---|
| Toyo Open Country A/T III | 35X12.50R20LT | 34.5 in (−1.4%) | 12.5 in | 602 |
| Nitto Trail Grappler M/T, load range E | 35x12.50R20LT | 35.04 in (+0.1%) | 13.39 in | – |
| Nitto Trail Grappler M/T, load range F | 35x12.50R20LT | 34.76 in (−0.7%) | 12.52 in | – |
Other 20-inch sizes against 35x12.50R20
Each size’s height against 35x12.50R20, and what a speedometer set for 35x12.50R20 shows at 60 mph with that size on.
| Size | Diameter | Width | Height change | At 60 mph shown |
|---|---|---|---|---|
| 245/50R20 | 29.6 in | 9.6 in | −15.3% | 50.8 mph |
| 255/50R20 | 30.0 in | 10.0 in | −14.2% | 51.5 mph |
| 255/55R20 | 31.0 in | 10.0 in | −11.3% | 53.2 mph |
| 275/55R20 | 31.9 in | 10.8 in | −8.8% | 54.7 mph |
| 275/60R20 | 33.0 in | 10.8 in | −5.7% | 56.6 mph |
| 275/65R20 compared | 34.1 in | 10.8 in | −2.6% | 58.4 mph |
| 285/55R20 | 32.3 in | 11.2 in | −7.6% | 55.4 mph |
| 285/60R20 | 33.5 in | 11.2 in | −4.4% | 57.4 mph |
| 33x12.50R20 compared | 33.0 in | 12.5 in | −5.7% | 56.6 mph |
35x12.50R20 compared
Every size: the tire size calculator. With the wheels off, the nuts go back on at your vehicle’s lug nut torque.
Questions
How tall is a 35x12.50R20 tire really?
35 inches by its name. Measured inflated, the makers’ tables on this page give 34.5 to 35.04 inches. Tread depth and the rim it’s measured on make the difference.
How many revolutions per mile does a 35x12.50R20 make?
576 by its diameter: 63,360 inches in a mile ÷ 110.0 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.
What metric size is closest to 35x12.50R20?
Of the common 20-inch sizes, 275/65R20: 0.93 inches (24 mm) shorter and 1.67 inches (42 mm) narrower.
Is 35x12.50R20 an LT tire?
Yes. Bridgestone’s guide describes flotation sizes as light-truck tires, written with LT after the rim: 35x12.50R20LT. They carry one load index, as they’re not made to run as duals.
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.