33x12.50R20 vs 35x12.50R20 tire size
A 35x12.50R20 is 2.00 inches (51 mm) taller than a 33x12.50R20, and the same width. Fit them in place of 33x12.50R20 tires and the speedometer reads low: at 60 mph on it you’re doing 63.6 mph, 6.1% faster, and the vehicle sits 1.00 inches (25 mm) higher.
Sources checked
| Dimension | 33x12.50R20 | 35x12.50R20 | Change |
|---|---|---|---|
| Overall diameter | 33.00 in (838 mm) | 35.00 in (889 mm) | +2.00 in (+51 mm) |
| Section width | 12.50 in (318 mm) | 12.50 in (318 mm) | 0.00 in (0 mm) |
| Sidewall height | 6.50 in (165 mm) | 7.50 in (191 mm) | +1.00 in (+26 mm) |
| Aspect ratio | 52% | 60% | |
| Rim diameter | 20 in | 20 in | |
| Circumference | 103.7 in (2,633 mm) | 110.0 in (2,793 mm) | +6.3 in |
| Revolutions per mile | 611 | 576 | −35 |
| Revolutions per km | 380 | 358 | −22 |
Check another speed or size
Metric, LT and flotation
At 60 mph on the speedometer you’re doing
63.6mph
+6.1% · the speedometer reads low
- Height
- +2.00 in (+51 mm)
- Width
- 0.00 in (0 mm)
- Ground clearance
- +1.00 in (+25 mm)
- Each side, same wheel
- 0.00 in (0 mm)
33x12.50R20LT and 35x12.50R20LT side by side
| Dimension | 33x12.50R20LT | 35x12.50R20LT | Change |
|---|---|---|---|
| Overall diameter | 33.00 in (838 mm) | 35.00 in (889 mm) | +2.00 in (+51 mm) |
| Section width | 12.50 in (318 mm) | 12.50 in (318 mm) | 0.00 in (0 mm) |
| Sidewall height | 6.50 in (165 mm) | 7.50 in (191 mm) | +1.00 in (+26 mm) |
| Aspect ratio | 52% | 60% | |
| Rim diameter | 20 in | 20 in | |
| Circumference | 103.7 in | 110.0 in | +6.3 in |
| Revolutions per mile | 611 | 576 | −35 |
| Revolutions per km | 380 | 358 | −22 |
The working
- 33x12.50R20LT: 33.00 in tall and 12.50 in wide, as the size says.
- Sidewall = (diameter − rim) ÷ 2 = (33 − 20) ÷ 2 = 6.50 in.
- Circumference = π × 33.00 = 103.7 in; revolutions per mile = 63,360 ÷ 103.7 = 611.
- 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.
- Speedometer. True speed = what it shows × new diameter ÷ old = 60 × 35.00 ÷ 33.00 = 63.6 mph.
- Ground clearance. Half the change in diameter: (35.00 − 33.00) ÷ 2 = +1.00 in.
Speedometer
A 35x12.50R20 turns 576 times a mile against the 33x12.50R20’s 611. With a speedometer set for 33x12.50R20, true speed is what it shows × 35.00 ÷ 33.00:
| Speedometer shows | True speed | Difference |
|---|---|---|
| 25 mph | 26.5 mph | +1.5 mph |
| 35 mph | 37.1 mph | +2.1 mph |
| 45 mph | 47.7 mph | +2.7 mph |
| 55 mph | 58.3 mph | +3.3 mph |
| 65 mph | 68.9 mph | +3.9 mph |
| 75 mph | 79.5 mph | +4.5 mph |
Clearance
- Ground clearance: +1.00 in (+25 mm), half the change in diameter.
- Top of the tread: +1.00 in (+25 mm), so that much less room under the fender.
- Each side, on the same wheel: no change.
A new wheel with a different width or offset moves the tire again. The sidewall goes from 6.50 to 7.50 inches.
What tire makers publish
Inflated on the maker’s measuring rim; the percentage is against the arithmetic.
| Tire | Size as printed | Diameter | Width | Revs per mile |
|---|---|---|---|---|
| Toyo Open Country A/T III | 33X12.50R20LT | 32.5 in (−1.5%) | 12.5 in | 639 |
| Nitto Trail Grappler M/T | 33x12.50R20LT | 32.76 in (−0.7%) | 12.52 in | – |
| 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 | – |
Each size on its own
- 33x12.50R20 tire size: 33.0 × 12.5 in
- 35x12.50R20 tire size: 35.0 × 12.5 in
Other comparisons
Questions
Can I fit 35x12.50R20 tires instead of 33x12.50R20?
They fit the same 20-inch wheels. A 35x12.50R20 is 2.00 inches (51 mm) taller than a 33x12.50R20, and the same width, so check three things first: that your wheels are within the 35x12.50R20’s approved rim width range, which tire makers list for each size; that it clears the fenders and suspension at full lock and full travel; and that its load index meets what your door-jamb placard asks for.
How far off is the speedometer with 35x12.50R20 tires?
With a speedometer set for 33x12.50R20, the speedometer reads low: at 60 mph on it you’re doing 63.6 mph, 6.1% faster. The odometer is off the same way: over 1,000 miles driven it shows 942.9.
Does 35x12.50R20 change the ground clearance?
By +1.00 inches (+25 mm), half the change in diameter, at the axles and at the lowest point under them. The width doesn’t change.
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.