33x12.50R20 tire size
33x12.50R20 is a flotation (inch) size: 33.0" tall, 12.5" wide, on a 20" rim — about a 320/50R20. The sidewall is 6.5" and the tire turns 611 times per mile.
33x12.50R20 specs
| Overall diameter (height) | 33.00" · 838 mm |
|---|---|
| Section width | 12.50" · 318 mm |
| Sidewall height | 6.50" · 165 mm (52% of width) |
| Rim diameter | 20" |
| Circumference | 103.67" · 2.633 m |
| Revolutions per mile | 611 (380 per km) |
| Closest metric size | 320/50R20 |
Equivalent sizes on a 20" rim
Sizes within ±5% of the overall diameter. Green rows are inside the usual ±3% limit for keeping the speedometer, ABS and gearing right; red rows are bigger changes that need clearance checks.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 275/55R20 common | 31.91" | -3.30% | -43 mm | 58.0 mph | compare → |
| 275/60R20 common | 32.99" | -0.02% | -43 mm | 60.0 mph | compare → |
| 275/65R20 common | 34.07" | +3.26% | -43 mm | 62.0 mph | compare → |
| 265/60R20 common | 32.52" | -1.46% | -53 mm | 59.1 mph | compare → |
| 305/55R20 common | 33.21" | +0.63% | -13 mm | 60.4 mph | compare → |
| 285/55R20 common | 32.34" | -1.99% | -33 mm | 58.8 mph | compare → |
| 285/60R20 common | 33.46" | +1.41% | -33 mm | 60.8 mph | compare → |
| 295/60R20 | 33.94" | +2.84% | -23 mm | 61.7 mph | compare → |
| 295/55R20 | 32.78" | -0.68% | -23 mm | 59.6 mph | compare → |
| 285/65R20 | 34.59" | +4.81% | -33 mm | 62.9 mph | compare → |
| 245/60R20 | 31.57" | -4.32% | -73 mm | 57.4 mph | compare → |
| 305/50R20 | 32.01" | -3.01% | -13 mm | 58.2 mph | compare → |
| 255/60R20 | 32.05" | -2.89% | -63 mm | 58.3 mph | compare → |
| 33x13.50R20 | 33.00" | 0.00% | +25 mm | 60.0 mph | calculate → |
| 33x11.50R20 | 33.00" | 0.00% | -26 mm | 60.0 mph | calculate → |
| 33x12.00R20 | 33.00" | 0.00% | -13 mm | 60.0 mph | calculate → |
| 33x22.00R20 | 33.00" | 0.00% | +241 mm | 60.0 mph | calculate → |
| 325/50R20 | 32.80" | -0.62% | +7 mm | 59.6 mph | calculate → |
| 375/45R20 | 33.29" | +0.87% | +57 mm | 60.5 mph | calculate → |
| 34x11.50R20 | 34.00" | +3.03% | -26 mm | 61.8 mph | calculate → |
| 305/60R20 | 34.41" | +4.27% | -13 mm | 62.6 mph | calculate → |
| 265/55R20 | 31.48" | -4.62% | -53 mm | 57.2 mph | calculate → |
| 33x14.50R20 | 33.00" | 0.00% | +50 mm | 60.0 mph | calculate → |
| 315/50R20 | 32.40" | -1.81% | -3 mm | 58.9 mph | calculate → |
| 355/50R20 | 33.98" | +2.96% | +37 mm | 61.8 mph | calculate → |
| 295/50R20 | 31.61" | -4.20% | -23 mm | 57.5 mph | calculate → |
Plus / minus sizing: 19" and 21" rims
Same overall height on a different rim. Check wheel width and clearance before switching.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 275/55R21 | 32.91" | -0.27% | -43 mm | 59.8 mph | calculate → |
Try another size against 33x12.50R20
Questions
What size is 33x12.50R20 in inches?
33x12.50R20 is about 33.0" tall and 12.5" wide on a 20-inch rim — roughly a 320/50R20 in inch sizing.
What does 33x12.50R20 mean?
33" overall diameter, 12.50" section width, radial, 20" rim.
What tire sizes are equivalent to 33x12.50R20?
On the same 20" rim, within 3% of the diameter: 33x11.50R20 (0.00%), 33x12.00R20 (0.00%), 33x13.50R20 (0.00%), 33x14.50R20 (0.00%), 33x22.00R20 (0.00%), 275/60R20 (-0.02%).
How many revolutions per mile does a 33x12.50R20 tire make?
About 611 revolutions per mile (circumference 103.7").
How these numbers are computed
Diameter = rim + 2 × sidewall, sidewall = width × aspect ÷ 100, circumference = π × diameter, revolutions per mile = 63,360 ÷ circumference. Real tires differ by brand by a few tenths of an inch. Last reviewed October 14, 2026.