31x12.50R16 tire size
31x12.50R16 is a flotation (inch) size: 31.0" tall, 12.5" wide, on a 16" rim — about a 320/60R16. The sidewall is 7.5" and the tire turns 651 times per mile.
31x12.50R16 specs
| Overall diameter (height) | 31.00" · 787 mm |
|---|---|
| Section width | 12.50" · 318 mm |
| Sidewall height | 7.50" · 191 mm (60% of width) |
| Rim diameter | 16" |
| Circumference | 97.39" · 2.474 m |
| Revolutions per mile | 651 (404 per km) |
| Closest metric size | 320/60R16 |
Equivalent sizes on a 16" 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 | |
|---|---|---|---|---|---|
| 265/75R16 common | 31.65" | +2.10% | -53 mm | 61.3 mph | calculate → |
| 245/75R16 common | 30.47" | -1.71% | -73 mm | 59.0 mph | calculate → |
| 265/70R16 common | 30.61" | -1.27% | -53 mm | 59.2 mph | calculate → |
| 235/85R16 common | 31.73" | +2.35% | -83 mm | 61.4 mph | calculate → |
| 245/70R16 common | 29.50" | -4.83% | -73 mm | 57.1 mph | calculate → |
| 215/85R16 common | 30.39" | -1.97% | -103 mm | 58.8 mph | calculate → |
| 255/70R16 common | 30.06" | -3.05% | -63 mm | 58.2 mph | calculate → |
| 235/75R16 | 29.88" | -3.62% | -83 mm | 57.8 mph | calculate → |
| 275/70R16 | 31.16" | +0.51% | -43 mm | 60.3 mph | calculate → |
| 235/80R16 | 30.80" | -0.64% | -83 mm | 59.6 mph | calculate → |
| 285/65R16 | 30.59" | -1.33% | -33 mm | 59.2 mph | calculate → |
| 285/70R16 | 31.71" | +2.29% | -33 mm | 61.4 mph | calculate → |
| 32x11.50R16 | 32.00" | +3.23% | -26 mm | 61.9 mph | calculate → |
| 31x10.50R16 | 31.00" | 0.00% | -51 mm | 60.0 mph | calculate → |
| 31x11.50R16 | 31.00" | 0.00% | -26 mm | 60.0 mph | calculate → |
| 31x11.00R16 | 31.00" | 0.00% | -39 mm | 60.0 mph | calculate → |
| 225/90R16 | 31.94" | +3.05% | -93 mm | 61.8 mph | calculate → |
| 30x11.50R16 | 30.00" | -3.23% | -26 mm | 58.1 mph | calculate → |
| 32x10.00R16 | 32.00" | +3.23% | -64 mm | 61.9 mph | calculate → |
| 32x9.00R16 | 32.00" | +3.23% | -89 mm | 61.9 mph | calculate → |
| 285/60R16 | 29.46" | -4.95% | -33 mm | 57.0 mph | calculate → |
| 225/85R16 | 31.06" | +0.19% | -93 mm | 60.1 mph | calculate → |
Plus / minus sizing: 15" and 17" rims
Same overall height on a different rim. Check wheel width and clearance before switching.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 31x10.50R15 common | 31.00" | 0.00% | -51 mm | 60.0 mph | calculate → |
| 255/70R17 common | 31.06" | +0.18% | -63 mm | 60.1 mph | calculate → |
| 235/75R17 | 30.88" | -0.39% | -83 mm | 59.8 mph | calculate → |
| 275/65R17 | 31.07" | +0.24% | -43 mm | 60.1 mph | calculate → |
| 31x12.50R15 | 31.00" | 0.00% | 0 mm | 60.0 mph | calculate → |
| 31x10.50R17 | 31.00" | 0.00% | -51 mm | 60.0 mph | calculate → |
| 31x11.50R15 | 31.00" | 0.00% | -26 mm | 60.0 mph | calculate → |
| 31x11.00R15 | 31.00" | 0.00% | -39 mm | 60.0 mph | calculate → |
| 31x13.50R15 | 31.00" | 0.00% | +25 mm | 60.0 mph | calculate → |
| 31x13.00R15 | 31.00" | 0.00% | +12 mm | 60.0 mph | calculate → |
| 31x16.50R15 | 31.00" | 0.00% | +101 mm | 60.0 mph | calculate → |
| 31x16.00R15 | 31.00" | 0.00% | +88 mm | 60.0 mph | calculate → |
| 31x18.00R15 | 31.00" | 0.00% | +139 mm | 60.0 mph | calculate → |
| 31x9.50R15 | 31.00" | 0.00% | -77 mm | 60.0 mph | calculate → |
| 31x14.50R15 | 31.00" | 0.00% | +50 mm | 60.0 mph | calculate → |
| 31x18.50R15 | 31.00" | 0.00% | +152 mm | 60.0 mph | calculate → |
Try another size against 31x12.50R16
Questions
What size is 31x12.50R16 in inches?
31x12.50R16 is about 31.0" tall and 12.5" wide on a 16-inch rim — roughly a 320/60R16 in inch sizing.
What does 31x12.50R16 mean?
31" overall diameter, 12.50" section width, radial, 16" rim.
What tire sizes are equivalent to 31x12.50R16?
On the same 16" rim, within 3% of the diameter: 31x10.50R16 (0.00%), 31x11.50R16 (0.00%), 31x11.00R16 (0.00%), 225/85R16 (+0.19%), 275/70R16 (+0.51%), 235/80R16 (-0.64%).
How many revolutions per mile does a 31x12.50R16 tire make?
About 651 revolutions per mile (circumference 97.4").
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.